The American Homebrewers Association (AHA) since 1978 has been supporting homebrewers. Visit the AHA for additional information.
The Beer Judge Certification Program (BJCP) Promotes certification of individuals for the judging of beer and related fermented products. The BJCP has developed standardized methods for structured evaluation for certified competitions. For a list of BJCP sanctioned competitions check out their calendar page. For the current BJCP style guidelines go here.