A site has just launched called Bopaboo. It claims to be a marketplace that allows you to resell unwanted MP3s to other people. There are only two valid conclusions to be had here - either it's a joke, or it's been set up by some people who haven't got the faintest idea about how digital music works.
At the moment it's still in private beta, but if you can track down an invite code (I found one on Google in less than 30 seconds) then you can try it out. You upload songs, and then others can download them at a price, at which point you get some cash, and the site takes 20%. No word on how much of that 20% goes back to the record labels.
The most hilarious thing? They expect you to delete the MP3 after you've uploaded it. On the upload page they say "Remember, once you sell a song, it is your responsability (sic) to delete all copies from your possession".
I love the idea here - that a legalised P2P service could be created where people can resell their music, and the labels get a chunk of the (reduced) price, but when it comes to digital files, there's absolutely no difference between 'new' and 'second-hand' music - it's identical. The IFPI will likely shut this site down faster than you can say 'piracy'.