In this area there are several links to martial arts, self defence, and assault prevention areas.
The The Cyberdojo is an area frequented by martial artists of many styles. Most are from "traditional" Japanese or Okinawan martial arts.
Aiki Jujitsu is an area of Aiki Jujitsu club at Stanford University. This style seems to comprise of strikes, joint locks, throws, and pressure point techniques.
Bay Area Model Mugging seems to be a fairly extensive assault prevention "course". I use the quotation marks because the system seems to be much more extensive than the usual short-term self defence class. This area originates in the San Francisco Bay Area.