Apple his finally released iTunes Match, alongside the iTunes 10.5.1 update, which allows subscribers to store their entire iTunes music library in iCloud, accessing it from any Apple device that they're signed into. The release comes about two weeks later than excpected, as Apple had announced that the feature would go public before the end of October. You're limited to 25,000 tracks, although iTunes purchases don't count towards that limit in any way, and all your music will be upgraded to DRM-free 256 kbps AAC files. Who's signing up?