My old friend Cole Whiteman has been making excellent process diagrams for years. i just noticed that he's put his visual design language online:
(326K PDF)
It's great to see people so thoughtfully and thoroughly document their notational thinking. We tend to reinvent the wheel whenever making diagrams, or we unthinkingly use the notation provided by our tools (this is at the core of Tufte's argument with PowerPoint), so it's good to see someone who's very good at visual explanation share some of their toolkit. it gives us perspectives on all the others.
Here's a pariticularly complicated and elegant example of Cole's work:
(717K PDF)
