I googled "butch femme" and the results gave me about 3 potential communities. This one, another one that seemed semi-active but dated, and a mailing list that seems inactive or I have trouble joining.
I got googling after having read this article:
Female masculinity and shame amongst lesbians, by Jessica Gird
I'm really liking BF Planet so far, and why would anyone wanna go anywhere else, right? In the bigger picture though, I hope eventually BFers will have more presence elsewhere as a greater community, with more hangout places like other more established LGBT groups out there.