26.7FPS on Qualcomm’s Neocore benchmark. This is about as fast as some results that are posted up on the Internet for HTC’s Hero.
Just as impressive is the extremely smooth Android UI transitions (YouTube link) and the interactive animated background wallpapers (another YouTube link). Be careful about that second link: at 1:55 or so there is a 2-second NSFW clip.
There are high-resolution photos of the Nexus One at BHeller. Finally.