It's hard to make a list of these off the top of my
head (I've got about 150 GB of the stuff v_v), but here's some that come to mind:
Hellsing Ultimate
Elfen Lied
Wolf and Spice
The Melancholy of Suzumiya Haruhi
Gungrave
IGPX
Le Chevalier D'Eon
Black Cat (though the manga is a lot better >.<)
Love Hina (ditto)
Macross Frontier
Bounen no Xamdou (translated Xam'd: Lost Memories, I believe)
Shakugan no Shana
Crest of the Stars
Cowboy Bebop
.hack//sign
And so many more that don't come to mind.