RS Owners Club – This is the club for all things Ford RS related, there is an active community of Focus RS owners here.
Focus RS buyers tips – This post by Dave ‘RS’ Smith gives all the info you need to indentify the differences between Phase 1 & 2 cars as well as some hints on what to look out for when buying.
Focus RS Mk 1 Parts Stock – This site has a lot of the old stock of new parts for the Focus RS.
Focus RS review by men&motors