Here're my most favourite serieses! ^_^
(I've seen more, but these are my top picks ~.~)

*Note* Yaoi & shounen-ai titles are listed in the shounen-ai/Yaoi section-!

Anime & manga Fan

(Fan of both the anime AND the manga ^^; )

Get Backers, obviously... <3

Full Moon wo Sagashite

Weiss Kreuz

Hikaru no Go!

Fruits Basket

Full Metal Alchemist

Naruto

Card Captor Sakura

Prince of Tennis

Hack Sign(anime), Dusk (manga)

Unlisted:: none ._.

Anime Fan

Kyou Kara Maou <3

Inuyasha ^^

Shaman King

School Rumble!!!!

Samurai Deeper Kyo

Bleach! XD

DNangel

Chrno Crusade

X/1999

Witch Hunter Robin

One Piece

Full Metal Panic

Comic Party

Unlisted:: ........*thinks*....

Manga Fan

Shounen Manga Fan

Shoujo Manga Fan

Angel Sanctuary

POWER! (or Girl Got Game in English ^^V)

Hana Kimi: Hanazakari no Kimitachi e

Hot Gimmick

Penguin Brothers

Rurouni Kenshin

Hands Off!

Demon Diary

Akuma de Sourou

Ayashi no Ceres

MARS

Blood Hound

Count Cain ^^

Shinshi Doumei Cross

Zettai Kareshi

Kodomo no Omocha

Kareshi Kanojo no Jijyou (His and her circumstances)

Chobits

Kamikaze Kaitou Jeanne

Imadoki

Fushigi Yuugi

Time Stranger Kyoko

Ranma 1/2

Love Hina

W-Juliet

Hana Yori Dango

Ichigo Channel

Unlisted:: The Wallflower, Dice, many others ...