I found this on BoingBoing, and like Cory Doctorow’s comment about it:
“Clockpunk” — a sub-genre of science fiction — appears to have been created while I wasn’t looking
Essentially, it’s a subset of Steampunk, but it pushes the time period back to the Renaissance instead of the Victorian era.
The link goes to a new blog, Da Vinci Automata, that’s devoted to the sub-sub-subgenre.