The Space Tugboat idea of the B612 Foundation
This group, formed in part by Apollo 9 astronaut Rusty Schweikart, is promoting an idea to use a space tugboat to push away a threatening space rock. They want to test it on a non-threatening planetoid around 2015.
http://www.b612foundation.org/
http://www.msnbc.com/news/980685.asp?vts=101620031211&cp1=1
