Hate the name (but then I'm an early boomer), but Slacker the audio service looks really interesting. I've posted about it four other times if you want to catch up (March 15, March 29, April 22 and June 19). Slacker is a competitor with the so-far better known Pandora and last.fm in that it uses a station metaphor, permitting users to customize music to their preferences and those of others like them. Rick Broida did a review of the Slacker beta for PC Magazine back in July to which I failed to link at the time. It's now taking orders for a mid-December delivery of a player that refreshes "station" content via USB or WiFi. Earlier reports had a satellite receiver dock coming that would give it true wide range mobile coverage. There are still references to it on the Slacker site, so even though the dock hasn't been released, I presume it's still on the way. Tom Gideon writes about the new player this month under the title, Slacker Portable Player (Finally) on the Way. Link: PC Magazine.
For commentary on this disruptive technology from a radio consultant's perspective, see Mark Ramsey, Slacker's personal radio player finally debuts. Link: Hear 2.0.
Updated 17 November 2007:
Also see Daniel Langendorf, Slacker Portable player is finally here as alternative to iPod and Zune. Link: last100. --Dennis