Sorry PC users, you'll have to wait for the end of the year. But, I'm using it now and it's great! :)
Apple describes the new service as "an online music store that lets customers quickly find, purchase and download over 200,000 songs from music companies including BMG, EMI, Sony Music, Universal and Warner Bros. For just 99 cents per song, without subscription fees, the iTunes Music Store allows burning songs onto an unlimited number of CDs for personal use, listening to songs on an unlimited number of iPods, playing songs on up to three Macintosh computers, and using songs in any application on the Mac, including iPhoto, iMovie and iDVD."
In addition new iPods were released. "Apple's third-generation iPods — 10GB model for $299 (US), 15GB for $399 and 30GB for $499 — hold up to 7,500 songs. They feature solid-state navigation wheel and buttons; new dock with audio out; "On-The-Go" playlist; customizable main menu; and Auto-Sync for automatically syncing your computer's music library with iPod."
The new iPod software update is currently only available for Mac users, and apparen't doesn't offer the neato new features like solitaire, an alarm clock, and menu customization. The updater for the iPod, along with iTunes are available for download right now. The Apple Music Store requires Quicktime 6.2, which is available for download as well.
View: Apple Music Store
View: The new iPods
View: iTunes 4.0
Download: iPod Updater 1.3 (Mac-only)
Download: iTunes 4.0 Download
Download: Quicktime 6.2