Eek! Is there no way to download an archive of the whole set from there (Like Trac)? [Sorry -- I'm totally unfamiliar with osdrawer...]
It's an svn repository, you can check it out with the "svn" command and have a local copy on your hard disk, which you will then be able to update when something new is available online.
Try running "svn help" from a terminal for some help.... by the way, would an svn add-on for tracker (à la tortoisesvn in windows) make a good GSoC project ?
-- Adrien Destugues / PulkoMandy http://pulkomandy.ath.cx