In the process of learning Unity I started a zillion projects but none of them ever got anywhere, save for a few. Here they are, resurrected for your enjoyment:
This was my first attempt at a racing game and really my first attempt at AI, complicated physics and real environment modeling.
This was my second try for a space game (the first version was basically the same, but with no textures and less interesting stuff) It features a more robust GUI system (my first), three playable ships and two levels. The physics are a little more realistic than some space games so it might take a bit of time to get used to. I never really fine tuned the gameplay in this one so it's a tad boring.
The Portal Project
After seeing the first footage from portal I took it upon myself to create a portal gun. I did in in a sort of hackish way that has some problems, but for the most part it actually worked.