Well, thanks guys... This really helps me.

Well thank you for the recommendation... I surely will read it!

After reading the Renai Idenshi XX, Yamanko, Kase-san, Pieta, Kawaii Anata, Strawberry Panic and
Hakodate Youjin Buraichou Himegami (even that some of them didn't really contain those what I search) I've really been addicted to this kind of manga... So fucki*g addicted!! [>.<] [>.<]

So do you guys have any recommendation/suggestion for best shoujo-ai or yuri manga that contain a tomboy/boyish character as the main lead?