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There is a wealth of informations available on bike aerodynamics now available on line. What peaked my interest was the article in Scientific American in the 1980's that showed the racers tuck having the same frontal area as a recumbent! Even a common steel frame bike with homemade aerobars can be very effective. Modifications including wheel covers, tube fairing, and fitted clothing can be done cheaply. Even if you don't want to go all out, just moving the end bar grips inboard to 5 inches from the center gives me a second hand position on my city bike good for a 1 mph improvement at 10 mph.
I recommend Edmond Burke's 'High Tech Cycling' and Lennard Zinn on triathalete bike position and maintainence.
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