I do have two alternate universes I am developing that I do write in. One is a Harry Potter derived universe using canon facts from up to Harry Potter and the Order of the Phoenix and is focused mostly on Tom Riddle and his life. I most likely will not post those here since I don't want to be attacked by the Tom Riddle fans who think that he should be written always and only as a sociopath. Also I just don't want to deal with people attacking me and accusing me of trying to re-write JKR's universe. I have no qualms with her story, I just like my AU too.
The other AU is one I'm constructing from the Batman Begins movie and the Batman comic books. This one is to be mainly focused on Jonathan Crane and will be the basis for the majority of my Crane fanfiction. These would most likely be posted here.
My writing usually is posted at my writing journal and stories there may or may not make it here.