...At the moment there is a second project-group using MARS.
The german documentation of first group can be found at http://www.cs.uni-paderborn.de/fileadmin/Informatik/AG-Kleine-Buening/files/ws11/pg-agents-2/Abschlussdoku-pg-1.pdf
If you want to start MARS, check out all eclipse projects and run "gui.product" as Eclipse Application from the "de.upb.agents.gui" project. You can also download the Application for your OS and just start it.
Further documentation will follow here. (project was started at sourceforge only two days ago)
Feel free to write us or post your feedback and suggestions here.