Cool stuff - had not heard about the 3D rendering linked in the article either. These are not trivial features to implement or maintain and seem to have a somewhat narrow audience. GitHub has such an amazing team and the core functionality seems pretty complete. I wonder if the "ship code" ethic and loose management structure (both of which I think are great) will inevitably lead to a bloated, feature overloaded product eventually. This has happened so very often in the past to others. So far they have been pretty good at closing down unused features.