While Google publishes the DMCA takedown requests in relation to their search engine results, it does not publish the requests for removal of content contained within their own infrastructure.
Perhaps Github should do a little further research before feeling "inspired".
what do you mean by "content contained within their own infrastructure"? I thought they forwarded the notices they get to chilling effects (and youtube ones are just posted in place of the video itself).
edit: this page http://www.google.com/dmca.html has about a 50/50 split across products between "may" and "will" be forwarded to Chilling Effects.
A quick search of term "xenu dmca" should show you come of the shit that google has to deal with in respect to the DMCA.
Any complaints about content on blogger, youtube or the adsense/adwords network get taken seriously and aren't forwarded on for the worlds entertainment.
Perhaps Github should do a little further research before feeling "inspired".