www.sustrans.org.uk - The UK's sustainable transport charity, responsible for the ongoing development of the National Cycle Network, together with their Safe Routes to Schools and Bike It projects.
www.lcc.org.uk - London Cycling Campaign - working hard for cycling in the capital
www.bikefix.co.uk - London based and online shop specialist in hard to find utility bikes and equipment
http://commutebybike.com/ - USA based website dedicated to cycle commuting.
http://www.bikecommuters.com/ - another USA based website catering for those who bike to work
http://urbanvelo.org/ - American website for bike commuters, fixies, hipsters, etc
http://www.ecovelo.info/ - Utility cycling specialist site with beautiful photography, focussed on practical bikes for everyday riding.
http://www.cyclescheme.co.uk/ - One of a number of concerns operating the Government's tax break bike to work scheme.
http://www.bikeforall.net - Bike For All - Cycling England's online portal with a host of information on varied cycling subjects.
http://www.copenhagencyclechic.com/ - Michael Colville-Anderson's longitudinal photo-study of one of Europe's utility cycling hotspots.
http://www.cyclechic.co.uk - London Cycle Chic - if you're a woman, want to commute by bike and look fashionable, all at the same time, then this is a good place to start.
http://bicycletutor.com - Bicycle Tutor - Bike Repair Video Tutorials - if a picture paints a thousand words, then how about moving pictures? Excellent Park Tool sponsored US bike repair site.
If you know some killer bike commuting links that you'd like to share, send your ideas to firstname.lastname@example.org with 'Commuting Links' in the Subject line.