Or Idol Pretender, My Barbaric Girlfriend, ones where it's guy to girl transformations.

I like the gender benders where the guy is transformed into a girl and falls for his best friend (male). I dunno why, but I enjoy reading their struggle. Maybe it's because I'm a psychology and biology graduate?

I've already read Cheeky Angel, Click, Kanojo ni Haru ni, Kakumei no Hi and a few others I don't remember the names of, but I know that they can't be the only ones that exist.

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I like the snow.

The only one I can think of right now that you haven't already mentioned is Nozomu Nozomi. Don't know who falls for who or what yet though.

There are a couple of others not on your list:
Megu Miruku
Sekainohate de Aimashou

Boy Meets Girl Girl Meets Boy - A common problem brings two people together. The boy is changing into a girl while the girl is changing into a boy.
Ame Nochi Hare (Bikke) - Haven't read it in a long time so I don't remember what is going on at the moment in terms of romance.
My Boyfriend Is a Vampire - He/She doesn't fall for his/her male best friend though.




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Remembrance, a forsaken thing that revokes ignorance and leaves people in doubt, is my only redemption and solace deep within the cascade of white.
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The evergreen trees speak of days long past when music mingled with the wind and sweet murmurs brushed our cheeks.