IMDb: Rat Patrol
Cast, crew, and production information.
http://us.imdb.com/title/tt0060018/

The Rat Patrol: Classified Dossier
Provides character profiles, photographs, filmographies of cast, mailing list, message board, and fan information.
http://www.klio.net/RATPATROL/

SunCompass - Navigating with the Rat Patrol
Discover real history while exploring the fictional universe of the series. Includes cast and crew details, quotes, and information on gear, uniforms, and geography.
http://www.fandom.tv/suncompass

Yahoo! Groups: Rat Patrol
Show, cast, character, and episode discussion. [Yahoo! registration required.]
http://tv.groups.yahoo.com/group/ratpatrol/