Soul Eater (Finished in a week basically.)
Seto no Hanayome (Just started it, if I laughed too much at episode 1, I'm going to lose my voice by the end of it)
Hayate no Gotoku (It somehow got more funnier after I started watching it on my iPod.. who knows why, but it worked. Finished about 40 episodes in 2 weeks ish)
The first season of Code Geass (the second season didn't grab me as quickly).
Death Note, because, holy oh my gawd, Liiiiight. -fangirls-
And Detroit Metal City, had me lulzing from the beginning.
Sometimes when I reflect back on all the beer I drink I feel ashamed - Then I look into the glass and think about the workers in the brewery and all of their hopes and dreams. If I didn't drink this beer, they might be out of work and their dreams would be shattered. Then I say to myself, 'It is better that I drink this beer and let their dreams come true than be selfish and worry about my liver.'
I loved the first episode of Sayonara Zetsubou Sensei. The opening scene is still among my favorites in the series.
I was pretty enthusiastic about the first episodes of The Melancholy of Haruhi Suzumiya and Higurashi no Naku Koro ni, which is notable because I watched the two of them back-to-back without knowing much in advance.
Moryou no Hako had an outstanding first episode. Sadly, the series failed to live up to it.
Princess Tutu's first episode was an excellent hook. A lot happens right away, and the episode's full of clever storytelling devices.
"Did I need to put a 'Fragile' stamp on it for you to take care of it? Was that really necessary for me to state it? Why can't anyone just ever know that the heart is a gentle thing? Something that needs constant care and tending?"
"I guess… if there was ever one man who knew that, he'd be perfect.
Elfen Lied (was my first real anime so yea was hooked from first ep)
Nana (or a bit later but i think right from the start)
Claymore (but dont finish it, read the manga after ep 18 :P )
Full Metal Panic: Fumoffu