Blender 2.64 is now available for download.what’s new in this version?
improved motion tracking using a planar tracker
easier green screen keying
new mask editor
new rendering got dozens of smaller features and improvements resulting from its use in production.
Sculpting now supports masks
a skin modifier was added to quickly create a model from skeletons
improved shadows and physics options in game engine
more Collada export options to tune for exporting to other game engines