Watch Samurai Champloo, it's from the maker of cowboy bebop (Watanabe). He is also working (not the directer though) on Michiko to Hatchin, this anime is running now.

Also Wolf's Rain is exquisite.

When does Code Geass end anyway? the freaking story is confusing.

simply put

Tsubasa chronicles

xxx holic (prime 24 episodes)

and xxxholic kei

erureka 7 is good too.

Yeah, YuYuHakusho basically rocks... And as further testament to such, I'd like to mention my favorite quote from the Adult Swim version (the more no-holds-barred of the English Language versions I've seen):

"Depends on which finger I use..."-- Yusuke Urameshi, when Kuwabara has the guts to say that his sword is better than Yusuke's Reigun, said while Yusuke gave Kuwabara the middle finger.