iTunes 10.3 is available to download now, you can download iTunes for both Mac and Windows and this new iTunes 10.3 compatible with new iCloud service.
What’s new in iTunes 10.3
iTunes in the Cloud beta gives you new ways to get your music, apps, and books from one device to another — wirelessly and without syncing. And the iBookstore comes to iTunes on your Mac or PC for an unabridged browsing and shopping experience. With iTunes, even getting your entertainment is entertaining.