In a nutshell, ACW is a 28mm skirmish game based in the American Civil War on steampunk steroids.
It's an interesting concept, and one that I have no knowledge of being tackled before. We've certainly seen alternative history WW2 games (Gear Krieg anyone?), but the American Civil War - and the Revolutionary War for that matter - have been largely untouched. It definitely caught my attention. Check it out and see for yourself.