Teleportation. I've got friends that live some distance from my home, so I'd get to hang out with them more. Plus, think of all the times you've gotten to work or school and you think "Oh shoot, I forgot _______". You could just zap home, grab, then zap back.
On a side note, it could, if done correctly, 1) Save gas/eliminate the need 2) Help with global warming 3) Present a new way of space travel 4) Save massive amounts of time.
*Drools at the thought/Geeks out*