I actually created something like this for the LA Hacks Hackathon last year. http://challengepost.com/software/coinama-vote-with-your-wallet http://challengepos

I actually created something like this for the LA Hacks Hackathon last year. http://challengepost.com/software/coinama-vote-with-your-wallet http://challengepost.com/software/coinama-vote-with-your-wal... The idea was a reddit-style AMA site where questions would each get a bitcoin address assigned to them. The Bitcoin sent to that address would be a bounty for the AMA subject to be able to claim after answering.