Gantz (Waaaaaay better than the anime):
http://www.crunchyroll.com/showmanga?cid=9718

REC (Another manga that's waaaay better than it's anime-counterpart): http://www.crunchyroll.com/showmanga?cid=962

ALL ROMANCE:

Vampire Knight
Moe Kare!!
Uwasa no midori-Kun
Hana Kimi
Power!! (girl got game)
Marmalade Boy
Mew Mew Power (kinda childish but i loved the romance)
Mars
Ren-ai Shijo Shugi
Kare First Love
Akuma de Sourou
MERU PURI (recommended too)
Love Monster
Special A
Koukou Debut
Shinshi Doumei Cross
Rockin' Heaven
Kare Kano
Fruits Basket
Crossroad
Can't Lose You
Full Moon Wo Sagashite
Kamikaze Kaitou Jeanne
B-men Kazoku
Desire Climax
Parfait Tic (greatest love triangle you will ever read with crazy hot bishies)
Skip Beat (totally diff. from all the other romance ones. about a girl becomming an actress to get revenge on guy she use to like who is a singer den she meets another actor dude. Highly recommended)

ders a lot more but i forgot. i will post more if i remember

vampire knight and god child

Love Monster by Miyagi Riko
Honey Hunt by Aihara Miki
Moe Kare by Go Ikeyamada
Get Love by Go Ikeyamada
Shinshi Doumei Cross by Arina Tanemura
Full Moon Wo Sagashite by Arina Tanaemura
Uwasa No Midori-Kun by Go Ikeyamada

Skip Beat - So damn funny and its unlike anything I've ever read. Yoshiki Nakamura is a genius. The only thing you'll regret is not reading it sooner ^_^

shugo chara
love monster
and
the bride of the water god

for me.........

1) Eyeshield 21........

2) One piece....

3 ) Naruto..............

anyone know where to watch Honey and Clover manga???

hmm well for me, itz Hat-trick.
best manga for me indeed.

Shin Angyo Onshi

Boku no Hatsukoi wo Kimi ni
Bitter virgin
Pastel
Suzuka

My favorite manga is One Piece

Shin Angyo Onshi, Claymore, and Hayate no Gotoku.