For those wondering what the Nouveau project has been up to with their open-source NVIDIA efforts via reverse-engineering besides the working OpenCL support, they have been setting their eyes on video decoding and other areas.
Martin Peres and other Nouveau developers were at FOSDEM 2012 last weekend where they shared a status update. Video decoding (using the hardware's video engines as opposed to just using GL shaders), OpenGL, reclocking and other features were talked about during the hour-long slot. Among the highlights is that the Nouveau NVFX support will hopefully be replaced soon by a re-written driver and that there's a re-worked (GLSL) shader compiler coming to the NV50 series (the pre-Fermi hardware going back to the GeForce 8 series).
Below is a Phoronix-recorded video from the Nouveau status update (or see the other page for the Nouveau OpenCL talk).