We've released BigBlueButton 0.61 (code named Titan). This release focused on stability, refactoring of source code, simplification of desktop sharing, and support for 640x480 video streams from web cameras.
You can check out the release notes here.
We also incorporated Xuggler, a java wrapper to ffmpeg, into our desktop sharing module for converting the images from the presenter's desktop into a video stream.
Xuggler is licensed under the Aferro General Public License. To understand how this license affects BigBlueButton, please see Installing Desktop Sharing.