I just know my sister-in-law and the girls devoured DNAngel. Full Moon and Ouran are good, though the Ouran manga is way crackier than the anime. Tutu... I thought was complete crack, but that's just me, haha. Also, series by Yuu Watase are really good. Imadoki is 5-6 volumes, and Absolute Boyfriend is still being released, but that's another one that's in Shoujo Beat and fairly popular. *tries to think of other ones they were gushing about* Oh Tactics WAS a big hit with the girls, too. They were all in love with Haruka.