At the moment, Jeroen Bakker ist doing a big overhaul of the Blender compositor to create a better user experience and adapt it to modern hardware. BlenderDiplom had the pleasure to interview him about the project and his experiences with crowdfunding!
OpenCL is currently one killer approach to computing-intesive tasks. Using this technique, the CPU and GPU share their computation power, which can lead to massive speedups of rendering, physics simulations and of course compositing. Behold, with your help this grand thing can come to Blender!