I have played with it for a while, and even wanted to mention it when I ran into it, but for some reason I just didn't -- I gave it as an example of situated software though. Anyway, check out webjay - a website with playlists made by anybody wants to share the music he/she listens to. For free. If you're after testing new musical stuff or listening to cool tunes, give it a try.

It works like a radio station with customized playlists - a collection of links where the tunes are located. If you like anything, you can download it. The downside is that you need a good connection for the audio stream - a problem in Romania, my RDS home cable connection just sucks. A question though: is it legal to download the mp3s for free? Please let me know if you have more info about it.