Been watching the coverage of the G1 this morning, and I have to say I'm somewhat impressed by some specific features of the device and OS, but the whole package doesn't have me even tempted to consider it a replacement for my iPhone. The web browser looks clunky to use compared to Mobile Safari due to the lack of multitouch, and there are some really odd UI decisions like the pullout drawer for extra apps. On the plus side, the street view looks slick on the phone, and having the Amazon DRM free music store integrated was a great idea.

Engadget has a ton of coverage of it, including videos.