Basically he sells 1M "pixels" for $1 each to show advertisings. The pixels you buy have an expiration date so he probably sold more than 1M px. I read somewhere that it works pretty well and brings lots of users to advertisers, probably because of the press and the momentum generated around the service.
fosk, I knew the website just didnt have time to finish my comment, actually. But no, the pixels never expire.
What I learnt with his project is what it means when your project goes viral. To me noone in sound mind would pay a dollar for pixel, boy, I was wrong.
Basically he sells 1M "pixels" for $1 each to show advertisings. The pixels you buy have an expiration date so he probably sold more than 1M px. I read somewhere that it works pretty well and brings lots of users to advertisers, probably because of the press and the momentum generated around the service.