Projection in Cycles

Just a simple question: Is it possible to project a picture (or movie) from a lamp/emission surface using Cycles renderer? If not yet a feature, anybody knows if its planned for and when it might be included?

This rendering:

(made in Messiah Studio) uses a photographof a forest on one of the overhead spots to achieve a tree shadow effect on the scene. This is the effect I wan’t to reproduce in Blender/Cycles.

Do you mean a gobo? I don’t think you can do that yet. But you could make a patterned mesh to block the light and create shadows.