VIDEO: Nexus One caught on film
In the two videos, one of which is above and the other is below, you can see the device booting up, complete with a snazzy X-shaped logo which is thought at the moment to be common to all Android 2.1 devices, you can also see the animated homescreen.
The site where the video has originated from, thenexusone.com, is promising many more videos to come. Except it's down at the moment, presumably through weight of traffic. When it comes back up, if any of them are worth posting, we'll add them below.