Cycling
Analytic Cycling - http://www.analyticcycling.com/
A analysis of technical methods in cycling. Looks at how they can work towards evaluating and estimating cycling performance.
Bicycle Helmet Safety Institute - http://www.bhsi.org/
Washington DC based cycling helmet safety organization. Promotes the use of helmets and explains cycling laws.
Cycling Links - http://cyclinglinks.tripod.com/
A cycling directory site that breaks down site categories into news, forums and general sites on cycling.