Comedy wise (can take Chobits place great):

Love Hina (classic, though some could argue, really just watch 1st 2 episodes and you can decide yourself I guess)
Great Teacher Onizuka (my favourite comedy to date)
Onegai Teacher/Twins
Maburaho
Yumeria
Azumanga Daioh (HAHAHAHA I still ring quotes from this one)

If your gonna go for something more heavy/dark I like Noir (I wonder why) and Gunslinger Girl.