Previewed at WWDC, launching in the fall.
Motorola ROKR iTunes Phone Review
The ROKR provides the first iTunes-enabled phone, but based on the initial reviews, it appears the phone has some room to improvent:
While I'm pleased that the phone finally saw the light of day, my pleasure just about ends there. As a phone, it's hardly cutting edge. And as a music player, it's a poor substitute for an iPod.
Criticisms include slow music transfers, limit of 100 songs, and slow user interface. That being said, according to reports, Motorola will be expanding their product line with future phones (possibly the RAZR) that also provide the iTunes software.