These links are tested "from-time-to-time" please let me know if any are no longer relevant or being used etc.
www.rsgb.org Our National Radio Society
www.eham.net/ - a great review site with interactive forums.
www.transmission1.co.uk/ - another gem of a radio site - all aspects of amateur, cb, scanning, 446 etc.
www.wsplc.com/ - Waters & Stanton radio suppliers - my emporium of choice.
www.sandpiper.entadsl.com/ - A good source of antennas at reasonable prices!
www.g3tpw.co.uk/ - I love the theory behind this antenna - check out the CobbWebb - I'll own one some day!
www.mods.dk/ - for the brave and fearless - pimp your rig - at your own risk of course etc.
www.rigpix.com/ - pictures of radios going back to Adam's first crystal set.
The Listeners Guide - A fabulous SWL'ing guide with so much info, and a great writing style
Julian's excellent site - Stealth Amateur Radio