Finding exceptional talent on GitHub certainly a solvable problem, but the real challenge for GitHire is the one you can see immediately when you pull up this page:
That page looks like a teaser. I tend to suspect that the "supermodels" are popping up for the same reason that, when you look at those T-shirt ads on the edges of blogs, every T-shirt is being worn by... a supermodel.
In practice, I presume they offer to try to screen for people who actually want to be hired, not just the ones with big scores on Githubbiness. I note that the very first thing they tell you to do on the "Job Seekers" page is to set your "hireable" flag on Github to true. (I didn't yet realize Github had such a thing, BTW. Thanks to GitHire for teaching me that, if nothing else.)
I didn't know about the hireable flag either. Cool feature for the genuinely unemployed, but imagine the team morale repercussions of setting your hireable flag to true while in a job you're looking to move on from...
http://githire.com/order
In the first few reloads, I've seen John Resig, David Heinemeier Hansson, and Yehuda Katz pop up. Maybe they're free to do a quick phone screen?
Here's hoping that there's a lot of secret sauce keeping companies from trying to date supermodels (most of whom are already in a relationship).