Road Bike Drivetrain Compatibility References

This will tell you what drivetrain combination works (or not):
http://www.wheelworks.co.nz/drivetrain.php

Then you can use a part from this company to adapt Campy, Shimano, and SRAM systems to each other, and also adapts 8S, 9S, and 10S:
http://jtekengineering.com/shiftmate.htm

(I saved this here, because I can never seem to find them in my Favorites folder!)