East Anglia Orienteering
Association
The British Orienteering
Federation
International Orienteering
Association
A complete interactive atlas of Great Britain
Organiser's and Planner's Manuals (SOS)
The BOF website has a page about Newcommers to the sport
The Essex Stragglers club also has a great Introduction Page
Noname
Ultrasport
Compass Point
Compass Sport An Independant magazine for the sport
Orienteering Online The latest news on International Orenteering.
Nopesport a forum/message board for all things orienteering - maintained and moderated by the nope cartel
I there are 3 but they all seem to be spam ridden:
rec.sport.orienteering, no.sport.orienteering and uk.sport.orienteering