Sheo_Dagana said:
Or Yuu Watase, who never finished Nana. >.>
You're thinking Ai Yazawa. Yuu Watase was Fushigi Yugi, which did have a few long breaks in its prequel series.
The Skip Beat thing does make me want to add to the bitchlist of anime that cut off well before the manga.
Negima
Haruhi Suzumiya
Ranma 1/2
Ouran Host Club
Fruits Basket (okay, some problems there given they got a character's gender wrong)
Tsubassa Resovoir Chronicles
I could probably dig up more, but some of those were hugely popular.