Finished or still going:
Dragonball (it's still going here, but I'm up to date ;P)
Love Hina
Cardcaptor Sakura: Master of the Clow
Pet Shop of Horrors
Boys Be (still going)
Shadow Star/Narutaru (still going... sloooooow)
Peach Girl S1
Peach Girl Sae's Story (I want to finish it, but I only have the first volume)
Saishuuheiki Kanojo/Saikano
Blood the Last Vampire 2002
Pita-Ten
Stopped following (after..)
Yu-Gi-Oh (first few pockets)
Alice 19th (first few pockets)
Negima (vol 6)
A.I. Love You (vol 3 or something)
Mermaid Melody Pichi Pichi Pitch (vol 1)
Chibi Vampire / Karin (vol 1)
Someday's Dreamers (vol 1, maybe I'll continue it)
Aaaand probably some more stuff I'm forgetting ;P I have this feeling I read more series...