Technology Fundamentals
My paper on the limits of light electric vehicle design.

Interesting Stuff
Fabric-based bicycle enclosures -- providing convenient weather protection in a light vehicle is a hard problem.

Guilty Pleasure
Ducati Monster -- about three times more power than needed, but how can you not love these bikes?
BMW G650 -- for the more obsessive engineer type.

Academic Journals
Transportation -- Kluwer's academic journal.

Associations/Communities
Bicycle Science on-line community
International Human-Powered Vehicle Association

More Books
From the American System to Mass Production - David Hounshell's fascinating book on American manufacturing, including detailed history of 19th century bicycle industry.

Bicycle power/speed calculator (not fully verified...occassionally a result seems fishy to me...)

Human-Powered Flight-- great stuff, even if impractical for useful transportation.

My whacky paper on why bicycling is bad for the environment. (Read it before sending hate mail, please.)