There is a miniatures game out that is pretty popular right now called WarMachine.
Basically, you are a mage-general commanding steam-powered exoskeletons called "warjacks".
The setting is supposed to be fantasy but steam power is 19th century....actually, I have no problem with that...it is not really a time period, per se. It is just that certain things lend themselves to fantasy while others do not. And, of course, it is highly subjective.
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I've heard of this game, though I've yet to come across any books on it
I saw the main site, I love the style