brabuhr / gmail.com writes:
 > I wonder if there would be in the Ruby community any interest in
 > setting up an "official git mirror" of the subversion repository on
 > GitHub.

Vladimir Sizikov set up a MRI repository for the Rubyspec project at
http://github.com/rubyspec/matzruby/. It contains branches for all the
current branches in the SVN repository so don't be afraid if you see it empty.

 > 'Hmm... which one of these 7 ruby repositories
 > (returned in a GitHub search) is the best/most reliable/most
 > trust-worthy/etc.'

We've been using it for 5-6 months now with no issues, so take a look and let
us know if you find it useful.

-- 
Federico