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Also making waves on the music front is the Slacker music service. It's a free streaming radio service, plus a portable playing device that can also stream over WiFi or Satellite connections (portable player coming "soon".) The company behind it, Broadband Instruments, has some big name executives from Diamond / Rio, MusicMatch, and iRiver. You can't listen to exactly what you want, but you can configure "radio stations" that will play particular artists you have selected, plus other artists that Slacker thinks are related to those you have chosen. The free service allows you to skip 6 songs an hour, while a future payed service will let you skip more.
Engadget has some more info.
Pretty big play. My guess is it won't work.