Update: Whoopsie. This one's been pulled. Have fun in the Google gulag.
Got some time on your hands? Feel free to watch the 10 minute video* above that showcases the UI of the Nexus One in all it's glory. Obviously it's still Android and familiar, but there's a lot more eye candy and fresher elements dropped in to give a more beautiful experience. We've seen a lot of this before in previous videos but it's definitely a lot clearer in this go around. The whole Android experience looks incredibly fast and fluid--the Nexus One definitely looks like the Android device to own when 2010 kicks off.
*there's a slight NSFW moment around the 2 minute mark, so yeah.