Death Note
Code Geass (that ending though...)
Mobile Suit Gundam Char's Counterattack (movie), Wing, G, Build Fighters, Stardust Memory, Double O (OO Gundam)
Sekirei (Echhi but with a surprisingly good amount of characters and actual plot once you get past the fan service)
Summer Wars (movie)
Hajime No Ippo (One of my personal all time favorites)
Gurren Lagann (not too high on my list but it's pretty good some people overhype the hell out of it in my opinion)
Baka and Test (One of my favorite comedy animes ever)
Yu Yu Hakusho
Rurouni Kenshin (spelling?)
Black Lagoon
Bobobo-bo-bo-bobo
Darker Than Black Gemini Meteor (some people hate it I personally like it)
Dragon Ball Z (Do I even need to list this one)
Hellsing Ultimate
Hero Tales (surprisingly good anime for how unnoticed it is)
Kill La Kill (thanks to the recent toonami showing this has become one of my newer additions)
Fractale (it's worth a watch not amazing but still pretty cool)
Negima!?
Madoka Magicka (not the full title)
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Honorable Mentions:
Pokemon
Rosario X Vampire (too much fan service and the characters aren't all that great in the anime but the manga is apparently better)
Yu-Gi-Oh
Requiem of The Inferno (That Ending...) 
The Melancholy of Haruhi Suzumiya (The movie as I don't particularly care for the anime though I have no problems with it)