A few off the top of my head: Square (payments), Tumblr (blogging), Blip.tv (web series destination & distribution platform - disclosure, I work here), Admeld (

A few off the top of my head: Square (payments), Tumblr (blogging), Blip.tv (web series destination & distribution platform - disclosure, I work here), Admeld (remnant ad inventory yield optimization for high volume sites), Doubleclick (bought by GOOG a couple years ago), Indaba (music remix platform), a range of creative services (rga and mrm and the like eat souls, though). There's a lot more here than finance, if you know where to look.