Family Compo - dunno if this is what your looking for... (crossdressing, gender role switching...)
Ichigo Channel - girl-pretends-to-be-a-boy idol manga... there are alot of these
Minto na Bokura - boy crossdresses as girl to get into his twin sister's school...
Operation Liberate Men - this one might interest you, I only read a bit of it a long time ago...