I came across this interesting manga about a week ago. It's about Yuuta and Yui, a boy and a girl that swapped bodies when they were children. Now they have to grow up in each others bodies, which isn't very easy.
Genres: Drama, Romance, School, Shoujo, Psychological, Gender Bender
The manga deals a lot with gender confusion and goes deep into the psychological genre, but it's still in a very shoujo-ish way.
It has about 30 chapters translated.
I really like the combination of Gender Bender, Psychological and Shoujo in this manga. The way the author deals with the problems is very interesting and never gets boring. It's very depressing though. I warned you.