And trust me, it sucks badly.
I have used PC's for many years now, but after becoming the proud owner of a 15Gb iPod, I leapt at the chance to preorder a new G5. Now I've just got to wait for it to turn up...
Anyway, the Windows Music Club is as some of you speculated above. Although MP3 files are supposed to be available, all I could find was <i>heavily</i> DRM's WMA files, which are restricted to 3 CD Burns each. The quality of the audio isn't that great, and in order to get the files onto my iPod I have had to burn the WMA's to CD and then rip them back to un-DRM'd MP3 files. Trust me - a total pain in the arse.
The store itself is OK in terms of design, but confusing when it comes to layout and the actual download process. Windows Media Player got stuck in an infinite loop of OK / CANCEL dialog windows after one download and had to be stopped by using the Task Manager (any of you that still use Windows on occasion will know what an indicator of crappy programming this is...).
Also, it seems that each record label has negotiated differing rights with M$ so that some files have unlimited CD burns, whereas some are limited to just 1 burn. The list of supported players you can transfer to reads like a who's who of disappointing consumer electronics (That creative labs player......please no...), with my trusty iPod being conspicuously absent.
Price wise, not too bad all in all. I got about 13 songs for my £10 outlay. Not quite $99 per track (Check the exchange rates) but OK-ish. Now I just hope my new 1.8 Ghz G5 ships soon and iTunes 4.0 gets it's Euro debut. Then I can finally consign my Wintel box to being a Linux dev server...