Nathan: I've committed Rigify to Blender svn now. So the addon should automatically appear in builds from now on. You'll still have to enable the addon, of course.
Future updates will be through blender svn. I won't be maintaining the bazaar repository anymore.
Here it is explained how to get Rigify addon for Blender - blenter autorig system. It is not part of the Blender now, but you have to get latest version through Bazaar version control software. Links:
Rigify Blender thread: blenderartists.org/forum/showthread.php?t=200371&highlight=rigify