depends what you like, *shifts through the 100 shonen weekly magazines on the bookshelf.
Worst is an awesome manga, read it in Japan, but i can't seem find it on the internet. If you do happen to find it give me a bell (seriously!). Coz im not in Japan anymore and miss it.
Another one is the
deathnote last chapter. The anime varied a bit in the last chapter and you might want to read how it really ended (although there wasn't much change, which is good).
Devil by OH! GREAT!, once again fantastic art. Also
Tenjou Tenge, once again the anime stopped before when it got REALLY good.
Claymore manga as well is pretty fun (as the Anime ending totally sucked
![[msn_red_fox_smilies-17.gif] [msn_red_fox_smilies-17]](./images/smilies/msn_red_fox_smilies-17.gif)
).
EDIT: Just heard you liked
Elfen Lied, so you can read the continuation of that (and the REAL ending) in the manga. Its pretty gruesome though.
To love ru is hilarious (don't watch the anime its crap!) but its real harem comedy, like real otaku. Its new but there is 100 chapters already. I read it coz of the comedy, 2d nudity just doesn't cut it for me for some reason. I suggest reading the trouble quest arc. But if you can... start from the beginning.
Trouble Quest Arc
http://www.onemanga.com/to-LOVE-ru/93/01/Site
http://www.onemanga.com/to-LOVE-ru/