FMA ; Gunnm ; City Hunter for my favorites
then I like well Azumanga Daioh & Yotsuba, Claymore, Berserk

Fullmetal Alchemist
Death Note
Ouran High School Host Club
Fruits Basket
Tsubasa: Reservoir Chronicle
D.Gray-man
D. N. Angel

-- favorites being ones I will read and reread

All Arina Tanemura (Kamikaze Kaitou Jeanne being my favorite by her)
Spiral~Suiri no Kizuna
xxxHOLiC
Kobato.
Cardcaptor Sakura
Pretty Soldier Sailor Moon
Fullmetal Alchemist (of course!)
Chrono Crusade

Arina Tanemura series are number one for me, but the rest aren't in any order. As you can see, I read a lot of shoujo. But the shounen I like I really love, hence those four up there. =) I want to try out more shounen, but a lot of the famous ones don't interest me at all. (Dragon Ball, Shaman King, One Piece, Naruto, Bleach etc) I am interested in trying out Fairy Tail though. The whole dragons and mages bit sounds like a lot of fun.

I don't read very many manga, but Fullmetal Alchemist is definitely my favorite. Possibly followed by Fruits Basket

Fullmetal Alchemist is one of my favorites, but my absolute favorite would have to be One Piece.

My favorite manga has to be Gakuen Alice. The characters are just lovely! And the plot is great. The only thing that I dislike about it is the fact that too many great characters die...

Here is my top 5 manga list:
1.Gakuen Alice
2.Fruits Basket
3.Mermaid Melody-Pichi Pichi Pitch-
4.Mamotte! Lollipop
5.Full Moon wo Saga....e

I never managed to actually read the whole FMA manga so I really can't classify it here but I couldn't even compare it with anything(I mean it's shounen manga, right!? All the other ones in my top are shoujo )

* Special: Fullmetal Alchemist

Neon Genesis Evangelion