You may have noticed http://github.com/apache/buildr/ popping up (and taken down). Apache Git clones are coming to Github, finally. Warning: early adopters will be used as guinea pigs. It will take a bit for that infrastructure to work at full steam, and we can expect clones to break at least once when git-svn-id changes once again from svn.eu.apache.org to svn.apache.org (which it should have been to begin with).
For now the safe bet is to clone http://github.com/buildr/buildr. We'll keep buildr/buildr synchronized with SVN and not-broken, and synchronize with apache/buildr when it's stable and ready. Assaf