How Roller Coasters Work - a great introduction! http://www.howstuffworks.com/roller-coaster.htm/printable
Amusement Park Physics http://www.learner.org/interactives/parkphysics/coaster.html
Physics Glossary - here's where you'll find the definitions for the physics terms involved in roller coaster design - kinetic energy, potential energy, friction, acceleration, and more! http://www.learner.org/interactives/parkphysics/glossary.html
Rollercoaster Database - this website should answer your questions about roller coasters around the world! It's an interesting one! http://www.ultimaterollercoaster.com/
Work and Energy - this website may be difficult to understand - it will require several readings to gather information. It's not for the wimps! http://www.physicsclassroom.com/mmedia/energy/ce.cfm