www.sel.noaa.gov (know about the weather before flying your birds)
www.elimarpigeons.com (lots of UK pigeon information)
www.racingpigeonmall.com (great natural health pigeon products)
www.pipa.be/ (worldwide pigeon sites, auctions, events, and more)
www.pigeonbasics.com (plenty of pigeon information for everyone)
www.whitemtnsrpc.com (a first class flying club in Arizona)
www.australian-pigeon-racing.com (honest information and concepts)
www.racingpigeonforum.com (another interesting and informative site)
www.topgunloft.com (top information from a top pigeon flyer)
www.iprr.co.uk (a variety of pigeon info.) 
www.btinternet.com/~meridklt (good info. from a good source) 
www.hm-e.net (approved USPS shipping containers)