New feature for Blender 3D? This is the kind of news that we always love to spread. The new feature today is called Grease Pencil and it`s been developed by Aligorith.
What can we do with it? Simple, you can draw over the 3D View. What for? Well, there are innumerous possibilities, like making notes about a model or simple review a work.
Here comes the best part, there are already a few test builds available, with Grease Pencil. Just visit graphicall.org and look for builds labeled "Grease Pencil". The first one just shows how to use Grease Pencil for review work, and the second one shows how to use it and make your own Blender build, with the Grease Pencil Patch on Ubuntu.