3D acceleration: anything that uses OpenGL(ES), which is pretty much everything that is 3D now. There isn't some switch that can be flipped on and off: either the program makes openGL calls which uses the hardware, or it draws to a flat surface in software; it's entirely up to the program to make these choices. I don't think any of the 3D games that are available even have a software rendering mode. Maybe the Doom engines do, but they hardly exemplify a good benchmark. But the Quake games and Mupen64 are all using the 3D hardware, at least.