Just heard about LaLa on KNTV, the local NBC affiliate (they do a pretty good job reporting on local technology news which is why I gave the link to their technology section instead of their main page).
Anyway, Lala does a couple of things. First, it let’s users trade CDs — the physical discs. They provide mailing materials and take a fee for each trade they facilitate (something like $1 for their services and $0.75 for shipping). Second, they have “radio stations”, not unlike Live365 and ShoutCast. I’m not sure how one goes about setting up a radio station but there are lots out there. To tune to a station, you simply select it. You need to have Javascript enabled and, pops a window that shows which song is playing and you hear music. It doesn’t look like it’s possible (yet) to play Lala radio stations outside of your browser (thereby obviating use with my SqueezeBox, it still looks interesting, though, and I think I can figure out how to piece together a URL.
I’ve only just started playing with it so, as I know more, I’ll post more.