For VSF inspiration, of course Wells and Verne and Rice Burroughs from the classics. The film Steamboy is perfect VSF set around the Great Expedition in London with steam powered suits, tanks and massive battle fortresses.
The Mortal Engines series (Phillip Reeve) is good inspiration with zeppelins etc, but more diesel than steam powered.
I am reading a more recent book called Fitzpatricks War (Theodore Judson). This is a post apolcalyptic novel set in 2400. Electronics/electricity has become unusable and everything is now steam powered and the current Super power is very reminiscent of Victorian England. The story starts off a bit slow but seems to be picking up now that I'm halfway through.
Doing a quick websearch Theodore has also written a book called The Martian General's Daugther which I think is along similar dystopian lines.
Cheers
Fuzzy.