PayPerPost creators Izea have launched Sponsored Tweets, which is exactly what it sounds like. You’ll set a price and if an advertiser thinks it sounds good he can buy a tweet from you. Then you write something about the sponsor and tweets it along with a link. Full disclosure is mandatory, which means that this actually isn’t as evil as one would perhaps believe. They have in fact managed to ensnare a few “web celebs” such as Chris Pirillo and Loren Feldman for example. Add ex-Playboy bunny (?) Holly Madison and you’ve got a nice mix of mainstream meets geek.
Tweets are sent via OAuth login to Sponsored Tweets. Check it out, but before you do that, tell me this: Would you click a link in an obviously sponsored tweet?