The old URL (http://www2.giganet.net/~yoshi/) isn't updated any more. The new one is: http://ruby-opengl.rubyforge.org/ In portage, we have 0.32d as stable, 0.32g in ~x86.
Unfortunately this isn't a straightforward bump: it's not clear to me if this is a replacement or a competing version. The new homepage mentions that this is based on the previous code, but there is also a license change and no mention of the previous author. Not clear what is going on here. I'd be happy with any insight into what is actually going on here. The build process is also changed quite a bit, and has a dependency that is not part of the tree atm. This may take a bit more time to put into CVS.
Current release: 0.60.0 (January 6, 2008) http://ruby-opengl.rubyforge.org/
dev-ruby/ruby-opengl-0.60.0 is now in CVS.