There are several really good videos on YouTube. Search Bicycle Fitting.
This one from the Boulder Center for Sports Medicine is very good...
http://www.youtube.com/watch?v=8kgpkZfjhmc

Also, there is another one given by John Howard in 5 parts, which really gets technical. Sorry I don't have a link.

Colorado Cyclist has a great fit article on their website. These guys know road bikes.
http://www.coloradocyclist.com/bikefit/