The newest release of MATSim ("Spring 2012") is now officially available.
We've updated several components of MATSim to improve speed and memory consumption as well as the stability of MATSim. But the best features are for once not in the MATSim release itself, but it its extensions. Along the main MATSim jar file, we also released MATSim Extensions for the first time. Extensions offer additional functionality not used by everybody, or more specialiced functionality that the core team cannot (yet?) guarantee to maintain.
Examples of extensions are include functionality to graphically edit road networks, or to convert transit schedule data from GTFS to the MATSim format. Have a look at the list of extensions and learn more about them.