A month or so back, Bruce introduced me to Fistful of Lead, a quickly set of rules for the old west. We had a very good time with the rules and I wondered if they could be adapted to low-powered superheroes. I finally got around to buying the core rule book as a pdf from Wiley Games and then pointed out some character cards (I tried to upload them, but blogger freaked out).
Overall, this worked well. The game was done in an hour (so you could play two games in a night easily) even with me learning the rules and having to look stuff up. Things were dramatic. The board was bit big at 4x4 feet. But the game could also have easily accommodated two more players (each playing a team of specialists (e.g., Robin, Batgirl, Black Lightening, and Black Canary).