BicycleSafe.com
An illustrated guide to bicycle safety, including an illustrated guide to how to not get hit by cars.
http://bicyclesafe.com/

BikeForums.net Advocacy and Safety Forum
Topics include helmet safety, children's bicycles, and bicycle advocacy.
http://www.bikeforums.net/forumdisplay.php?forumid=8

Commuting and Road Safety
A forum to chat about commuting and road safety.
http://www.cyclingforums.com/index.php?board=8

Melbourne Magpies - Watch Out Cyclists!
Provides details of local locations for cyclists to avoid.
http://www.step-hen.com/magpie.htm

Bicycling Life's Safety Advice Page
A large site that covers vehicular cycling concepts, including riding and maintenance tips.
http://www.bicyclinglife.com/SafetySkills/index.html

Seidler Productions
Traffic education for kids, public service announcements, links and bicycle safety products.
http://www.seidlerproductions.com

MassBike Bike Laws and Legislation
Links to the bicycle laws for US states and beyond.
http://www.massbike.org/bikelaw/

National Bicycle Safety Network
An American coalition of public and private organizations and agencies working together to increase safe bicycle use. Great resource for safety issues, especially traumatic head injury reduction.
http://www.cdc.gov/ncipc/bike/default.htm

Bicycling Street Smarts
A compact tutorial on how to ride a bicycle in mixed traffic.
http://www.bikexprt.com/streetsmarts/index.htm

John Forester's home page
Vehicular cycling information from a pioneer in the field.
http://www.johnforester.com/

Safe Cycling Lessons
Safe cycling tips from the Lawrence Livermore Lab in California (note - applies to U.S. road law).
http://www.llnl.gov/es_and_h/lessons/cycling_e.html

ProBicycle
On-road bicycling advocacy.
http://probicycle.com/

Bicycling articles by John Allen (& guests)
Articles on bicycle safety from an expert.
http://www.bikexprt.com/bicycle/index.htm

Bicycle Law.com
Legal advice for injured cyclists hurt in traffic accidents or by defective cycling products. Founder Bob Mionske is a cyclist and attorney, and a two time Olympian and former US National Champion.
http://www.bicyclelaw.com/

Palmetto Cycling Coalition
A non-profit organization dedicated to making South Carolina safe for all cyclists.
http://www.pccsc.net/

Bicycling: Commuting, Touring, Camping, and Safety
Commuting and safety tips.
http://www.khurramweb.com

Bicycle Helmet Safety Institute
Information on bicycle helmets, standards, and cycling laws; the helmet advocacy program of the Washington (DC) Area Bicyclist Association.
http://www.bhsi.org/

Chainguard
Vehicular cycling email discussion group.
http://sports.groups.yahoo.com/group/chainguard/

eMedicine Health - Bicycle Safety
Consumer health resource center providing bicycle safety information.
http://www.emedicinehealth.com/bicycle_safety/article_em.htm