The illustrations look really nice! He says he uses Visio 2007: http://duartes.org/gustavo/blog/post/quick-note-on-diagrams-and-the-blog http://duartes.org/gus

The illustrations look really nice! He says he uses Visio 2007: http://duartes.org/gustavo/blog/post/quick-note-on-diagrams-and-the-blog http://duartes.org/gustavo/blog/post/quick-note-on-diagrams-....