I saw this topic's title and panicked, thinking for a moment you were suggesting something about DF being released on a popular game distribution system from Valve Corporation.Anyway, I do think warm tiles should generate steam if next to damp tiles, water, or ice. Then we could have geysers!
well, throw a turbine in there somewhere to spin from the steam, and you can make elevator shafts that run on a pulley system for mining, and super magma vent heated steam death traps that melt the goblin skin right off, or create masterful kitten roasts automatically, if only accidentally.Of course, you'd have to find a way to channel the power and distribute it, similar to the water wheel.