Raze, Super Karoshi, and The Company of Myself are my favorites.
Raze is the only one I still play, and I think it's probably my overall fav.
Super Karoshi is great, the first time I played it I laughed so hard.
I don't play The Company of Myself anymore, but when I first did I was like, "Wow... someone actually came up with this..." That game is so ingenious. It's gotta be the most original game I've ever played.