Being astute music listeners, you out there in vF-land may have already heard of lala. But if not, you may find it interesting. It is a service through which you trade your old cd's for others' old cd's. You don't trade directly; you trade into and out of a pool. You pay $1.49 for each disc received, which covers prepaid mailers and protective cases. Plus the artists get $.20 for each disc traded.
It is in beta, but is easy to get into. I have been a member for a week or so and have already passed along several discs I didn't listen to. This could be good for people with lots of discs, who probably also have a number of discs they don't listen to. You can get invites by going through PC World:
blogs.pcworld.com/staffblog/archives/001571.html.
This not perfect by any stretch. For starters, finding and passing on very obscure music is not very likely at this point. However, they have set it up in such a way that there is no harm in giving it a try.