I love the idea of Github as a resume, and this is easily one of the best features that push it in that direction. It allows for a quick glance at what an author contributes the most to, which can be a quick way of identifying the most successful projects they work on.

It really fixes the problem that organizations always had of visibility. My commits to an org repo usually weren't visible on profile except in the feed and as a link to the organization. This is a big improvement.