A new version of Blender came out March 6: 2.66a. You can download Blender here. If you are not using the Archive Version install, save yourself some hassle in the long run and use that install.
There are release notes for Blender 2.66a. The notes are mostly about bug fixes. The release notes for Blender 2.66 are about the new features in this version of Blender.

One of the new features is the addition of: Dynamic Topology Sculpting. Previous versions have sculpting tools that only allow you to move existing vertices. The dynamic tool will allow the addition of vertices as you sculpt. I have yet to try it, so I am not sure how it works. I imagine this will be handy for modelers targeting Second Life™.
