The fledgling startups listed below will present their ideas and initial products to investors at this spring’s Y Combinator Demo Day on March 18. Of the 19 companies in this batch, 10 have already launched and only one remains in stealth mode. Most of them have been in development for only three months.

Chatterous

Chatterous connects various forms of communication so that people can message each other regardless of the form they use most. Currently the service ties SMS, email, IM, and web together so that messages sent using one technology will be received by others using any of the other technologies. This works by setting up a group on Chatterous’s website and putting down all the ways your friends can be contacted. You can then start sending messages to them immediately, meaning that they don’t even have to change their own behavior all that much. Chatterous launched in public beta last week.

Addmired

Addmired provides the AddHer and AddHim social network widgets, both of which display two user profile pictures at a time and ask users to answer certain questions about them, such as “Who’s more popular?” The founders argue that their widgets are more appealing to social network owners than other widgets, because they help drive traffic within the social networks, not siphon traffic out of them. They look to establish service level agreements with some of the smaller social networks. We covered the service in February here.

Snaptalent

Snaptalent is an advertising network for job listings that uses IP detection to determine whether website viewers work or study at particular companies or institutions. It then displays listings from employers who want to attract workers from organizations known for their talent, such as Facebook or Harvard. See our review of the service from this week here.

RescueTime

RescueTime helps individuals and businesses track how they spend their time at the computer, and consequently, find ways to become more productive. The web-based dashboard charts application and website usage over long periods of time and shows you whether you’ve been reaching your goals. So far, 278 businesses have signed up for RescueTime for a total of 26,132 seats. See our review from last May here.

MightyQuiz

MightyQuiz is a user generated quiz destination and widget provider that we covered recently. Users are encouraged to answer trivia questions from a wide range of categories. They can also submit their own questions and embed them on their sites. The site is very sticky: the average session lasts 8 minutes (or 19 questions). As a comparison, the founders claim that Slate has an average session length of 4:22 and Wired has 3:34.

Tipjoy

Tipjoy is an easy micropayment system for the web. It has been designed to cut out the steps necessary for website visitors to leave small amounts of money for content publishers, such as bloggers. The Tipjoy button placed on a website asks for only an email address and by default registers a donation of 10 cents. The service is nearing 70,000 impressions per day and the founders are exploring different models for micropayments, such as employing them to finance high definition video on the web. We wrote about Tipjoy here.

8aWeek

8aweek promises to save you hours of time wasted each week on time-drain websites like Facebook and Drudge Report. The 8aweek browser toolbar will track your website usage, remind you of how much permitted time you have left on each restricted site, and even block you from particular sites once you’ve spent too much time on them. See our review from February here.

WebMynd

WebMynd provides a visual interface for reviewing your browsing history. The founders draw comparisons to Gmail – just as Gmail obviated the need to sort messages into folders by providing effective search and tagging, WebMynd renders it unnecessary to manually bookmark sites and organized them into folders because it’s easy to search and visually flip through the pages you’ve visited. WebMynd operates as a Firefox toolbar and has already indexed 8M page impressions. We wrote about them in January.

BaseShield

BaseShield will protect Windows PCs from malicious viruses and attacks by leveraging virtualization software. Its methods improve on existing anti-virus solutions by preventing all types of attacks, not just the recognized and documented ones. The service has yet to launch.

Insoshi

Insoshi is an upcoming white label social networking platform. It will differentiate itself from many of the other social networking platforms by taking a completely open source approach (think: WordPress of social networks). The software has yet to be released.

Mixwit

Mixwit describes itself as a combination of Slide and iTunes. While it has more ambitious long-term plans, it currently provides an easy way to make sharable mix tapes with songs found through the MP3 search engine Seeqpod.

Omnisio

Omnisio will help you annotate and share videos from any website. It will also add structure to the existing video content on the web. The service has yet to launch.

Deluux

Deluux aims to become a distributed Facebook, or an inverted Ning, by relocating the center of people’s online identities to their websites, which exist outside of any one social network. The service will facilitate the distribution of personalized content around the web and help drive traffic to these personal websites. It has yet to launch.

Wundrbar

Wundrbar wants to improve upon the search bar experience by providing users with powerful inline commands. The idea is reminiscent of YubNub but Wundrbar strives to appeal to a larger audience and to incorporate functionality that helps people manage their personal online accounts in addition to searching the web.

YumDots

YumDots wants to be the go-to mobile application for finding places to eat when out on the town. Its emphasis on using interactive maps to display information about local restaurants makes it more efficient than other mobile review services like Yelp’s. The service has yet to launch.

280 North

280 North will debut with a web-based PowerPoint clone called “280 Slides” that strives to mimic the desktop experience and features the ability to export presentations to PowerPoint format. The founders’ longer term goals consist of providing a JavaScript-based development framework for building desktop-like applications for the web. None of these services, however, have been launched yet.

Kirkland North
Kirkland North wants to take an infectious campus-wide game popular at Yale and Harvard last year and spread it to other campuses around the country. The Risk-like game pits sections of campuses against each other in a virtual battle for university-wide domination. While the founders have plans to roll out an integrated solution that can serve many institutions at once, they are currently rolling out individual versions of their online service, such as one for Stanford that launched only two weeks ago and already involves 20% of the campus.

Joberator
Joberator will help employers find developer talent by encouraging computer science students to refer their developer friends, of whom they have more intimate knowledge than any professional recruiter. Incentives for personal referrals are created by employers who list the bonuses they will pay to pay those who recommend candidates eventually hired. The service has yet to launch.

Another Y Combinator startup launches today, this one with the intent of making online job listings more effective.

Snaptalent is essentially an advertising network for jobs (currently, jobs for developers in particular). Employers add their job listings and the service displays them on the sites of participating publishers. Sixteen programming blogs have signed up so far, bringing their 4.5M+ monthly unique visitors with them.

Here’s an example of what two Snaptalent job ads looks like:

The system was designed to make it easy both for publishers to load the ad widget (a simple JavaScript snippet) and for employers to set up attractive advertisements, ones that perform better than the typical Adsense unit. Snaptalent has provided point-and-click tools that not only help employers design their banner-sized ads; they also allow employers to upload photos and embed videos that complement the text descriptions shown when users click on the ads.

But here’s the really interesting twist to Snaptalent’s strategy for getting job listings in front of the best candidates: in addition to placing ads on the blogs and websites trafficked by the target demographic, Snaptalent actively detects the IP addresses of all those websites’ visitors. It then uses the IP information to determine whether particular visitors work for companies like Google – or are enrolled at universities like Carnegie Mellon – where the best talent can be found. When employers set up their job ads, they can indicate a preference for particular organizations and their ads will be shown to those organizations’ members.

So how much does this cost advertisers? $250 for every 500 people who click on their ads, regardless of whether those people have been targeted by IP address or not. These pre-paid (and therefore guaranteed) clicks can be purchased in 500 unit increments up to 2,500 people per posting. Publishers who display the widget on their sites will get an undisclosed share of the revenue they generate.

The founders of Snaptalent say there’s nothing else available that competes directly with their offering (although deadpooled Edgeio came the closest). Of course there’s a variety of companies approaching the online job listings market in their own way. Broadly speaking, Snaptalent should be grouped with the aggregators (Indeed, Simply Hired, ZamZim, etc.) rather than the destinations (Monster, HotJobs, Jobster, etc) because they most clearly recognize the importance of distributed listings.