Just installed Crossover iTunes Preview release. 3.1.0 alpha 2 that is available for current Crossover customers.
This release is a special, iTunes-only preview that install in a different directory and only supports the installation of iTunes.
I was able to preview, download, and play songs from the iTunes music store.
The Internet Radio did not work for me, and the IPod and CD-burning is not supported.
Performance is slow at this point but usable when not multi-tasking.