Code Search API
github.com
github.com
It would be one thing if Github ran (or at least sanctioned) a feature that warned you of possible security problems, but I don't think I'd like potentially multiple, poorly-coded bots going around messaging repo owners.
There are already really good ways to do that which don't involve making connections to remote servers.
My biggest issue with github search is it still has issues with searches like $i++ as it will not match something like for(i=0;i++;i<100) which is occasionally frustrating. For reference a comparison http://searchcode.com/?q=i%2B%2B vs https://github.com/search?q=i%2B%2B&type=Code&ref=searchresu...