Hmm... Good anime that I've watched...
The Melancholy of Haruhi Suzumiya
Code Geass R1 and R2
Death Note
Spice and Wolf
The Daughter of Twenty Faces (This is an awesome anime and deserves more recognition)
Ouran High School Host Club
Soul Eater
Hetalia: Axis Powers (well, I'm kind of obligated, I used to RP as America on Facebook)
High School Of The Dead (kind of)
Kuroshitsuji/Black Butler
Elfen Lied (I was forced to watch it)
The World God Only Knows (I can't stand the recent English dub though - maybe that's just me being used to the sub though)
Yu-Gi-Oh + GX and 5Ds (although I feel like I'm looking back at the original and GX through nostalgia-vision)
Dragonball + Dragonball Z (Hell no to GT)
FullMetal Alchemist: Brotherhood (I preferred it over the original FMA anime)
Tengen Toppa Gurren Lagann (because sheer awesomeness, that's why)
Sayonara, Zetsubou-Sensei (and its follow-up series')
Pokemon
Digimon (the Original and then most of the follow-ups and spin-offs)
Bleach (note to self: Do not power through 250 episodes of an anime - it's not fun)
Kore wa Zombie desu ka?
Durarara!! (I just wish more volumes of the manga were out in English)
Ao no Exorcist (although some of the imagery was kinda disturbing)
To Aru Majutsu No Index (-looks at my profile pic- ...Betcha didn't see that coming)
To Aru Kagaku No Railgun (I kind of enjoyed this a little more than Index, on the whole)
Bakuman (although, in my opinion, the manga is definitely better)