I'm working on a MASON manual which will detail more or less every feature of the system at present. Unlike the ECJ manual, which is just that, I'd also like to have one or two tutorials and a bit of discussion about agent-based simulation. Anyway, I've put out the first chapter and a running (far from final) title. The first chapter is a tutorial largely cribbed from the WCSS 2008 tutorial. Thought you might be interested. http://cs.gmu.edu/~sean/temp/mason.pdf