yUML ( http://yuml.me ) is brilliant for quickly putting together simple, nice looking diagrams. It's based on Graphviz and doesn't require graphical tools, just a basic text language, so you can throw together something for a demo in 2 minutes. I'm working on a tool to parse Objective-C into yUML at the moment- https://github.com/darkFunction/DFGrok
Interesting! I built yUML and have an iOS apps company, we should use your plugin. And add it to the yUML community page :) Thanks -- Tobin