The best UK-focused archery forum on the web. It's 'A great place for a chat and a slice of cake', apparently!
Archery Interchange UK
If you want some serious technical knowledge, this is the place to find it. Some users are top international archers, or coaches, and don't mind passing on the tips to us lesser mortals!
Aussie archery forum, worth checking out for its 'technical centre', if nothing else!