Fic Search...

I'm looking for fics that explore gender identity, rather than sexual identity. Slash/het/gen, doesn't matter. Predominantly looking in the HP fandom, since that's what I read most of, but I'll happily look at Highlander or Stargate fics, as well. I don't mind if sexual identity is a theme as well, but I'd really like to find some fics that deal with gender identity. Any links would be greatly appreciated!