http://www.youtube.com/watch?v=RkWTfOzIqDM- This is the number one roller coaster in the world. Kingda Ka, short but sweet!
http://www.youtube.com/watch?v=EBS9cNq_OcM- This is the number two coaster in the world. Looks fun!
http://www.youtube.com/watch?v=sX43kOKfR6I- This the number three coaster in the world, it's called steel dragon, in Japan!