Heh, I actually wrote that comment when Github was down this weekend... 

My worry with the current URLs is that an internet connection is required to use vincent in ipython notebook, which could be very frustrating in some situations. 

Ideally, it'd be great if there were some way to have the notebook take care of this on its own. It feels kinda hacky to just inline some 3rd-party JS in the middle of a notebook.