50 ways to kill an asteriod

This week in Washington, D.C. hundreds of scientists attended the Planetary Defense Conference 2007 to discuss different methods of destroying asteroids. There were tons of ideas- some reasonable, and others not so much. Some of them wanted to destroy asteroids with nuclear weapons and other wanted to send unmanned robots to the asteroid, drill into it and send the debris into space to alter the course of the asteroid. There's also a diagram on this site that offers detailed instructions on how to "avert Armageddon".