I have already seen
Spice and Wolf
Phantom: Requiem for the phantom
Darker that Black
Clannad + Clannad AS(currently my favorite anime)
Elfen Lied
Rosario + Vampire
Trigun
Shuffle
the sacred blacksmith
Jyu-oh-Sei:planet of the beast king
Highschool of the Dead
Canaan
Haruhi Suzumiya
I really do enjoy the "slice of life" type anime.
[Edited on 10.05.2012 10:38 PM PDT]
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Fullmetal Alchemist - Which has already been said Baccano Black Butler Rosario Vampire Those few that come to mind.