No Blender nerd will have missed the recent introduction of motion tracking, which provides a nice workflow for mixing video footage and 3D models. While awesome, the current motion tracking implementation is limited to video footage with significant enough camera movement and perspective shift and (as far as I know) there is currently no easy way of mixing 3D models with still images or fixed tripod shots, so I decided to put together an add-on for this purpose.
The add-on is called blam, The Blender camera calibration toolkit, and facilitates modeling based on still images. You can download it from here. Note that blam is still in development. If you’re interested in contributing, just drop me a line.