I am pleased with how people have reacted to this however I notice it might not be a theme readierly known to some so to try and bring people up to speed, I present a series of links to clink...
A tumblr account which posts all manner of SteamPunk-esque images and what I was actually looking at when I decided on the challenge theme.
A wiki page, because of course, there had to be a wikipage. While not as fun as bashing things into google and seeing what you come up with, it is still a useful tool. ^^
Like with all tvtropes pages, I warn you not to wander into random link clinking. You could stray from the path and become lost in tab after tab of information and soon have wasted away as you read artical after artical.
A short list of movies and tv shows where they employ the SteamPunk style. I do not vouch for the quality of these, some are fairly bad. However these maybe things you've watched without noticing they are SteamPunk.
The Wild Wild West - Not the movie, the show they based the movie on.
Murdoch Mysteries - Rather fun detective show where the cases often are caused by or solved by some steampunk version of a modern invention... And there is one episode with a rideable drilling machine.
Steamboy - An anime that is required watching for all steampunk fans.
League of Extraordinary Gentlemen - The movie that seems to have retired Sean Connery. Not the best but... Well it's not the best. <_< The comics are better I hear.
Atlantis: The Lost Empire - Disney's animated venture in to steampunk (not count the aspects of it in The Great Mouse Detective or mixed steampunk and cyberpunk in Treasure Planet).
Twenty Thousand Leagues Under the Sea - From 1954, it is pretty much seen as one of the first steampunk movies. It isn't but it is seen that way by most.
Sherlock Holmes/Sherlock Holmes A Game of Shadows - Both the 2009 movie and it's sequal are (soft) steampunk.
Wild Wild West - Yes now this is the movie. Not very got but they do have a giant steam powered spider so can't leave them off the list.
And lastly two short animations that may interest you guys ^^
The Amazing Screw-On-Head was a character created by HellBoy creator Mike Mignola. This twenty-two minute pilot highlights several elements of the steampunk trope, from the technology to the fashions. Warning: Might not be suitable for all viewers.
A short animated pilot for a show called Constant Payne which sadly never made it to a full show. While not true steampunk (as it mixes in some Dieselpunk and Teslapunk), it has elements of Steampunk in the technology and some of the clothing.