Y Combinator - http://ycombinator.com/
[From their website] Y Combinator is a new kind of venture firm specializing in funding early stage startups. We help startups through what is for many the hardest step, from idea to company. "Since 2005 we've funded over 460 startups, including Loopt, Reddit, Clustrix, Wufoo, Scribd, Xobni, Omgpop, Weebly, Songkick, Disqus, Dropbox, Twitch, Heroku, A Thinking Ape, Machine Zone, Airbnb, Heyzap, Cloudkick, WePay, Bump, Stripe, CarWoo, Mixpanel, Cardpool, Optimizely, AeroFS, E la Carte, Hipmunk, Meteor, Rap Genius, Codecademy, SocialCam, and Exec."
Etsy - http://www.etsy.com/
[From their website] Make money by selling handmade things; can buy handmade things.
[From their website] At betaworks, nimble, loosely connected companies match users, data and content to create superb products, great API's and profitable businesses.
College Start-Ups - http://www.college-startup.com/
Says you can get rich from your own dorm room. ~Meg
Prosper - http://www.prosper.com/