Space Elevator

http://www.space.com/businesstechnology/050923_spaceelevator_test.html

This looks pretty awesome, once someone actually completes building one, it will dramatically reduce the costs and dangers of getting people and materials into orbit, and once in orbit, you are "Halfway to Anywhere in the Solar System".  I hope to go up one day, and maybe even to mars if the price is right, can't afford that yet though.