Google Open Source Blog: Export a Git Project to Google Code
http://google-opensource.blogspot.com/2008/05/export-git-project-to-google-code.html
"Git and Subversion can work together in many ways. Previously, we showed how Git users can work with a project primarily managed by Subversion. In this post, we describe one way to handle the converse: Google Code acts as a stable read-only Subversion mirror of a Git project. In this model, patches are first applied to the central Git repository and exported to Google Code later."