These 50 icons are released under Creative Commons Attribution-No Derivative Works 3.0 and can be used commercially - just don't redistribute them without written permission.
As some of you might know, TurboMilk designed the logo and mascot of Iconfinder. Their talented designers have provided at great illustration of the IconFinder mascot for this anniversary. There's no doubt that the work by them has helped IconFinder's growth the last year. If you're launching a new app or service you should hire TurboMilk.