These things are interesting and good ego-candy (or not), but one thing that always bothers me about sites that import your projects from Github is that they never seem to look at the open-source projects for which I'm a core team member (unless it happens to be one with its canonical repo is under my personal account).

Like, when someone is a core team member working on rails, that's a big difference from simply having a fork of rails under your own username. But these sites would never look at the core rails members because the official rails repo is under the rails namespace, not anyone's personal account.

Because of this (and many many other factors), it would be hard to ever use something like this to actually assess a given developer's chops.