This is the system I game most on, even when I'm at home and could play PS2 or on my computer. It's just so addictive and I like the feel of it! (I have the small SP.) I played Tetris (old one) for a while, followed by F-Zero GP, and now I'm getting into Harvest Moon. I also play FFTA sometimes.
I feel bad because I don't own any of the traditional titles like Castlevania. I need to look into buying at least one Castlevania title.