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The APM is the UK's professional body in the field. It gives details about news, training, qualifications and events. A catalogue of publications is available. The resources section has a useful glossary of PM terms, full text of the APMs Body of Knowledge publication, & some links to other sites.
The PMI is the professional association in the US but has over 150,000 members worldwide. PMI establishes project management standards, provides education, training and professional certification. The site contains substantial information including: listings of events & conferences; membership & interest group details; details of publications. Its Knowledge Center database enables searching of PMI literature from 1990.