Love anime.
Death Note, Suzumiya Haruhi no Yuuutsu (The Melancholy of Haruhi Suzumiya), To Love-Ru (NSFW, Ecchi), Rozen Maiden, Ghost in the Shell (1, 2, SAC and SAC: SSS), Lucky Star, Azumanga Daioh, Devil May Cry, Black Cat and so on are my favourites thus far.
Out of those, my top 3 are Haruhi, Black Cat and GitS.
Edit: I watch the Japanese versions, as I can't stand the way producers cheap out on western actors. It sounds better in Japanese anyway, and there are several subtle jokes that you would miss out on if you watch it in English.