Steampunk is also very hot, although many people make the mistake that anything Victorian is Steampunk. Not so:
Steampunk is a genre which originated during the 1980s and early 1990s and incorporates elements of science fiction, fantasy, alternate history, horror, and speculative fiction. It involves a setting where steam power is widely used—whether in an alternate history such as Victorian era Britain or "Wild West"-era United States, or in a post-apocalyptic time —that incorporates elements of either science fiction or fantasy. (From Wikipedia)
I like some of it, but like most trends, I'm getting sick of seeing it all over the place.