Favorites: Dragon Ball/Z (up to the Frieza saga)(GT sucks ass), Naruto/Shippuden (the filler parts suck, but the story line is cool, and I have to add this, Hinata is fucking hot), Inuyasha/Final Act (I think the character development was awesome), Samurai Champloo (there's not enough words to say how great this was, even if Fuu was a whiney bitch), Full Metal Alchemist/Brotherhood (when I first read about it, I didn't think I'd like it, but it turns out it's pretty good so far), Bleach, Ninja Scroll (I don't care much for the sex scenes, but other than that, it's ok), Vampire Hunter D, Cowboy Beebop, Deathnote (the plot is absolutely amazing, and I love the characters)
Least Favorites: Trinity Blood (I don't know what to say about this, other than it gave me a headache, and was boring as hell), Princess Mononoke, anything Gundam (I don't really get into the tech things so much), Sailor Moon, Ghost in the Shell (no real reason other than I just couldn't get into it)
Honorable Mentions: Yuyu Hakusho (I think it's pretty good), Elfen Lied (that's one fucked up anime), Pokemon (early), Yugioh (early), Akira (some people love it, some people hate it, I kind of liked it)
One's to watch in the future: Slayers, Rurouni Kenshin (my little brother has been trying to get me to watch this one)
One's I don't plan on watching: Evangelion, Ranma 1/2, One Piece (this one just looks crappy, with a bad story line)
I try to only watch anime's that I think I'll like, so the not like list is kind of small. I tend to like shonen, and particularly (as you can tell from my list) Shonen Jump.