Bike Winter - for those who believe that weather is no obstacle.
BikePlan Source is managed by a Montana-based (US) consulting firm to help communities improve their bicycling conditions. The site includes a growing and evolving online bicycle planning and program guide, an extensive reference library, news and views, and access to other sites.
National Center for Bicycling and Walking is the major program of the nonprofit Bicycle Federation of America. Their mission is to create bicycle-friendly and walkable communities.
The Pedestrian and Bicycle Information Center is a US-based clearinghouse for information about health and safety, engineering, advocacy, education, enforcement and access and mobility. The PBIC serves anyone interested in pedestrian and bicycle issues, including planners, engineers, private citizens, advocates, educators, police enforcement and the health community.
Walk and Bike for Life is a Canadian-based non-profit that seeks to promote trails, greenways and urban parks - and all the benefits that go along with them. The organisation advocates walking and biking and the development of associated infrastructure and programmes. The web site includes useful links to resources and projects.
Way to Go is a program and toolkit to encourage reduced dependence on car travel to and from school.