For the past few years the joint-universities games academy in Denmark, DADIU (National Academy of Digital, Interactive Entertainment) have been creating some impressive productions with their one-month vertical slice of AAA-games. During these productions the students are coming in from several different universities, to bring together specialists with different educational backgrounds to each work on their part of the pipeline.
This year the students had been given the choice of using Unity, and guess what; all of them went with Unity! I really think you should check out the students' productions, it is really amazing how much they managed to pull off given the one-month time limit. You can find games and post-mortems on this webpage: http://www.dadiu.dk/english/games-09, and below you can find screenshots and links to Unity Webplayers of some the games.
A puzzle game which feels like a mix between The Lost Vikings and Professor Fizzwizzle all in 3D of course. Adding to that they have really well executed graphics and sound.
Graphically stunning Alice in Wonderland-like 2D-platformer game, with some interesting gameplay elements, like mystery black clouds and mirrored worlds.
And more games from DADIU: