I know we haven't pushed out some new sources in a while now. My apologies.
We were hacking a lot of things into IronRuby for our RubyConf demo, and we're now spending the time here to make sure that they're implemented the right way. We're now back to a clean state in our internal repository and we're working on integrating the new features that we showed into the codebase. It might take a few more days before we get to another known good state, at which point we'll push out a new source code drop to SVN.
Thanks,
-John