Apple has today launched a beta of the new iTunes version 10.3 which, above all, includes the new iCloud functionality (or at least some of it).
You can grab your hands on the new version via this link. It’s available for Mac and Windows (32 and 64 bit). The download (at the time of writing) is running horribly slowly (currently getting about 30kb/s on the 77MB download) – but I’m guessing that’s down to demand and should return to normal sometime later this evening.
I’ll post up the good news when I’ve got it going!