Martial Arts Guide - Reference site containing information about specific martial arts and self defense disciplines.
Martial Arts World Search - Over 1200 links in this Hypermart based search engine. Has lots of pop-up and banner adds.
Rec.Martial-Arts.Resource - A general site relating to martial arts, their study and practice. Focuses on information from the rec.martial-arts newsgroups
SoYouWanna study martial arts? - An article that lays out the basics of martial arts, including how to find a class, how much to pay, and the differences various styles.