There was a pretty big turn out for the steampunk scene at Dragon*Con 2012. Most of the pictures I got (which turned out, anyway) were from the Dragon*Con parade, and it look like there were some really talented makers and builders of all kinds of steampunk costumes, devices, and even vehicles!
I have an additional article up on Meta-Earth about Dragon*Con 2012 itself, along with more pictures from the Dragon*Con parade.