As has been mentioned before, Ronin Arts will be releasing short supplemental PDFs that require Steam & Steel. As I've had the text for months I've already digested it and, in fact, the first supplemental PDF will be released this week.
So if you don't yet have Steam & Steel -- and you have a love for steamtech devices and situations -- you'd better grab a copy of the PDF so that you're ready as soon as the Ronin Arts PDFs start hitting RPGNow.
With the Iron Kingdoms Characters Guide hitting stores soon, and Steam & Steel now available, and Eberron, I suspect a lot of steamtech goodness to start hitting existing and new campaigns. I'm trying to write these Ronin Arts PDFs with the same sense of the "generic" in mind that I do my other releases so that people can incorporate a lot of these into any steamtech campaign setting.
I'm rambling again. Sorry.