Genius

http://goviral.com/


and

http://www.milliondollarhomepage.com/

and

http://en.wikipedia.org/wiki/I_Am_Rich/

and

http://www.megavideo.com/?c=rewards

and

http://www.businessinsider.com/best-selling-iphone-apps-2010-9#ifitness-saves-you-money-on-a-trainer-8

and

http://www.soraspy.com/
Attrackt visitors by giving them a chance to interact (poll/voice opinion)