The Blender Foundation has released Blender 2.68
From the announcement:
The Blender Foundation and online developer community is proud to present Blender 2.68.
Many different mesh modelling tools were added and improved. Cycles render performance was improved on Windows and on GPU's. The motion tracker can now automate placement and choice of markers more with new tools. Smoke rendering quality has been improved to reduce blockiness.
Python scripts and drivers are now disabled by default when loading files. This is for improved security, without this feature malicious .blend files could cause problems. See the Python security documentation for details.