Looking at OneManga.com, I've decided to read manga and watch anime from each letter of the alphabet. Some of these aren't from OM, but most are. Because for some of these, I just picked from the list on One Manga, it's a mix between the english and japanese names. I may not have completed some of these (such as Inuyasha or Naruto), but I did spend a lot of time reading and following them for a while.
(#) 7th Period is a Secret
Aishiteruze Baby
Backstage Prince
Ceres, Celestial Legend
Dakishimete Noir!
Enren Debut
Fruits Basket
Gaba Kawa
Highschool Debut
Inuyasha
J
Kare First Love
Love Luck
M.T. Pass
Naruto
Ouran High School Host Club
Princess Ai
Q
Random Walk
Saiyuki
Taranta Ranta
Uwasa No Midori-Kun
Vampire Knight
W
X
Yoru Made Matenai
Zettai Kareshi
Currently Reading
These are incomplete manga that I am following. I check these periodically for new chapters. The numberr in parentheses is the last chapter I've read.
Beauty (15 + oneshot)
Black Bird (20)
B.O.D.Y (28)
Dengeki Daisy (24)
Faster than a Kiss (31)
Full House Kiss (19)
Hapi Mari (12)
Kitchen Princess (15)
Kyou Koi wo Hajimemasu (47)
Love Berrish (13)
Oishii Kankei (36)
Orange Chocolate (14)
Skip Beat (160)
SLH - Stray Love Hearts (6)
Suki-tte Ii Na Yo (12)
Uwasa no Midori-Kun (24)
Watashi ni xx Shinasai (15 + extra)
Slowly Reading
Unlike the above, these are completed manga that I have decided to read, but have not finished, most likely because they are long.
Alice 19th (23)
Beauty Pop (6)
Kaichou wa Maid-sama (26)
Kindan no Koi de Ikou (5)
Manga Alphabet