This excellent website is geared towards people who use their bikes every day, for commuting, errands or whatever.
It offers great advice on safety, dealing with traffic, the savings in time and money, the health and environmental aspects and advocacy issues such as why special bike lanes are dangerous, not needed and a waste of money.
Highly Recommended!
This site has all the information you need to improve cycling conditions in your city or town. There's lots of Federal Money available under the TEA 2001 Program. Check out this site to learn more. You won't be disappointed!

Bicycling Magazine is the Worlds Largest
Cycling Publication. It is chock full of tips on
nutrition,
safety, repairs, touring and much more.

The San Fransisco Bike Coalition has an excellent web page which promotes their mission to improve bicycling in San Fransisco. There are resources available here which could help others trying to improve biking anywhere.
Check it Out!
A bike is stolen every seven seconds!
Register your Bike!

Check out this page by the D. C. Bike Courier Association.
Ken Kifer has put together some very fine pages about biking, touring, safety, fitness, helmet wearing and much more. His extensive touring experience, (over 100,000 miles), fills his pages with wit and knowledge. His pages are much better than anything I could ever come up with, and make this a MUST CLICK link.

Harris Cyclery, Some say this is the best
cycling site on the web! And they are located only a
few miles away in West Newton, Mass.

The League of American Bicyclists
represents over 35,000 bicyclists, 450 recreational biking clubs and 50 cycling advocacy organizations all united in the desire for a more bicycle friendly America.

The International Bicycle Fund is a nonprofit organization promoting sustainable transport and international understanding. Major areas of activity are non motorized urban planning, economic development, bike safety education, responsible travel and cycle tourism, and cross cultural, educational programs.
There's lots to read here, Check it out!