The Nexus One is now available for AT&T and Canada's Rogers network
Update: The N1 is also coming to Sprint soon...
Google's Nexus One phone is now shipping in another version that supports the frequencies used by AT&T in the US and Rogers in Canada. The phone is still unlocked, and costs $529. The Nexus One has a 3.7" touch WVGA AMOLED, runs on Android v2.1 (1Ghz CPU), 5Mp camera and comes with a 4GB microSD.