Do you mean in terms of anime?
Hmm.. this could take a while.. xD
Well, Higurashi [no Naku Koro ni/Kai/Rei], Ghost Hound, Ghost Sweeper Mikami, Psychic Detective Yakumo, Hidamari Sketch [x365], Azumanga Daioh, Serial Experiments Lain, Blue Gender, Samurai Deeper Kyo, Gunslinger Girl, Revolutionary Girl Utena, Paranoia Agent, FLCL, Cowboy Bebop, Trigun, Yozakura Quartet, Stratos 4, Samurai 7, Nana, Kaze no Yojimbo..
That's just a small portion of the ones I've actually watched, but they're some of my favorites or the ones I'm currently watching and enjoy. ^o^