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Justin.tv

Y Combinator Class of 2007

This project began as a single, 24/7 video channel streaming from the brim of founder Justin Kan's baseball cap. It now has more than 5 million registered users and more than 41 million unique visitors a month.

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Scribd

Y Combinator Class of 2006

Scribd makes it easy for users to publish and share documents on the web. It has raised more than $13 million and won awards from BusinessWeek, Forbes and Fast Company.

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Reddit

Y Combinator Class of 2005

Acquired by Condé Nast in 2006, Reddit went on to win the 2008 Open Web award. This year it provided the initial idea and organizing force behind the "Rally to Restore Sanity," to be held in Washington, DC this weekend.

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Posterous

Class of 2008

A lightweight blogging platform, Posterous is in fierce competition with NYC-based Tumblr. So far it has raised $5.14 million.

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AdStruc

TechStars Class of 2010

After graduating from the Boulder, CO, class of Techstars, AdStruc came right to NYC. Last month it raised an impressive A Round of $1.1 million from a who's who of NYC VCs.

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Marginize

Techstars class of 2010

Marginize brings the social web to any site, creating a sidebar that lets users check in, comment and view other users who are on the site at the same time. They raised an A Round of $650,000 in August from big names like Atlas Ventures.

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Dropbox

Class of 2007

Dropbox lets users store and share files in the cloud. It won a 2009 Crunchie award, a Mac World Editor's Choice award and has raised $7.2 million in funding.

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Kapost

Techstars Class of 2010

A classmate of AdStruc, Kapost just raised its own $1.1 million A Round. This startup gives publishers the ability to quickly and easily grab content from a large network of syndicated partners, turning any site into a mini Huffington Post.

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Socialthing

Techstars Class of 2007

A service that put users numerous social media accounts in one easy to manage place, it was acquired by AOL in 2008 for an impressive $5 to $10 million.

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Graphical.ly

Graphical.ly is a platform for delivering digital comic books and building a community around them. This is a fast growing market, especially on tablet computers, and Graphical.ly just raised $1.2 million earlier this year.