Hm, let's see...
There's Ouran Highschool Host Club
Shugo Chara
Sailor Moon
Toradora
Mermaid Melody Pitchi Pitchi Pitch
Tokyo Mew Mew
Nana
Sorry a few of those were Mahou Shoujo! I don't watch regular old Shoujo that much ^^'' I've never seen Nana, but I have heard it's one of the best Shoujo anime!
Anime related to Kaichou wa maid-sama is: Special A,
But there are many good animes such as:
Kamisama Hajimemashita <3
Kimi ni Todoke
Lovely Complex
Shugo Chara
Vampire Knight
Torani no Kaibutsu-kun
Kaze no Stigma .