   Smoke cloud
  I'm still creating models for my game, but I wanted to figure out early on how to make smoke in game.  Can I just create a bunch of quads, mask them with a smoke texture, and then blend them with the screen?  Anyone else have a better way?   
  I think using billboards is the only way to do it. Just blend them and that's all.   ;  well, new hardware would also allow you to use 3D textures and ray-trace them.   ;  you could search google for "volumetric smoke" there should be some work on it.