Proper code search could be a pretty killer feature on its own. Half the time I need to find something on github I just clone the repo and search from my own computer.
You can use their public search UI or install the extension.
Heh, yes. Github's search is case insensitive and ignores sigils, braces, etc.
I've been waiting years for GitHub to put some real effort into code search and cross-linking. I had given up on it, but I suspect this will be a high priority for Microsoft.