multiple remote branches in git-svn (the right way)

There are several pages out there that explain how to use git-svn with multiple remote SVN branches but not all of the branches in your SVN repository. I need this for MPICH2 where I have two problems:

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graphviz examples

If you are ever doing very much graphviz work and you get frustrated by the lack of a comprehensive set of examples, I found a pretty good one on flickr

(creative commons, see that main flickr link for more info)