I love his diagrams! Friendly and accessible. Found a post on how he makes them: http://blog.ezyang.com/2010/04/diagramming-in-xournal-and-gimp/ http://blog.ez

I love his diagrams! Friendly and accessible. Found a post on how he makes them: http://blog.ezyang.com/2010/04/diagramming-in-xournal-and-gimp/ http://blog.ezyang.com/2010/04/diagramming-in-xournal-and-gi... though if you have a tablet and a good sense of design the software is probably not that important.