I had the opportunity to hack a bit on RubyOSA recently, and I could introduce some good things in the SVN repository.
The most important changes are writable properties and i386 support. Other than that, several small bugfixes/improvements (better type conversion, better support of broken dictionaries, etc…).
Oh, and we have a new geeky sample that periodically sets the iChat status to the uptime(1) command output: