RoboWar 5 for Windows - Freeware port. Screen shots, FAQ, and tournaments. - http://robowar.sourceforge.net/RoboWar5/
The Fishman's Robowar Page - Downloadable robots, hints and tips, and an introduction. - http://alumnus.caltech.edu/~jsabbott/ja82/robowar/robofirst.html
The Elmorian Site: RoboWar - Offers sample robots, a robot code disassembler, links, and tournaments. - http://www.bemuzed.com/elmorian/robowar/robowar.html
JRoboWar - Java implementation of the game. - http://www.bemuzed.com/jrobowar/jrobowar.html
Yahoo! Groups - Offers message board sorted by date. - http://groups.yahoo.com/group/robowar/
Optimizing Robots in RoboWar - Tom Cornell's article on code-design tricks and tips. - http://tcl.sfs.nphil.uni-tuebingen.de/~cornell/optimizations.html