Past secret santa gifts: One year I got a homemade plush Cactuar. Another year I got a Wii game. Both were awesome gifts. Unfortunately, I couldn't tell you what I got other people those years.
Things you should probably avoid getting me: movies, clothing, or anything that is too over-the-top nerdy. I embrace my hobbies, but I also like to display them in good taste. If you are absolutely uncreative, ask the people who play TF2 what you should get me.