I'm not knocking the idea, but this sounds incredibly dangerous.

Think of it a lot like the Apple App Store and the jailbroken Cydia repositories on iPhones. If you install things from elsewhere, well, you have no form of security. Great for power users and people who can read and evaluate code, but pretty much useless for anybody else.

When you combine this with GitHub, well, the implications are terrifying. With a minor amount of effort, one could create scripts to create github accounts, fork legitimate plugins, insert a couple lines of malicious code, and thus flood the search results with malware intended specifically for this case. Each of these steps is easily scriptable, and can be done without even installing "git" on your computer, thanks to github's easy forking and editing.

For something like this to be useful, it needs verification and authenticity. It needs a way to eliminate the forks and the false results and to confirm authorship. None of that is in github, at present.