Looking good. Reading this though, I couldn't help thinking that Bundler and RubyGems should possibly be the same thing. They are both pretty much essential to running/developing any non trivial Ruby application. Why not make them the same so we don't have compatibility problems? This would remove a lot of code from Bundler that is used for supporting a bunch of old versions of RubyGems. It would also pretty much dissolve compatibility problems between the two, since there would be test coverage to make sure everything worked for that version.
I'd like to hear more about what is being done on the packaging front, specifically Rubygems v Debian.<p>Last I heard, the Debian folks weren't too happy with RubyGems because people who install RubyGems can upgrade gem dependencies without updating dpkg resulting in an inconsistent state. IIRC there was effort underway to bring RubyGems and all of it's gems into the dpkg repository.