i think so. I was in the apple store a few weeks ago and some woman came in and said she had been running her OS and HD and everything from an external drive cause something happened to her computer, im not to sure though. it sounded kind of strange.
It's a program that uses the motion sensor and lets you switch between OS X and Windows (or another OS) by tapping the side of your macbook/macbook pro like an old style type-writer. But I'm not sure if you need bootcamp or parallels to run it, or maybe it works with either one. YouTube "smackbook" and check out the videos, looks way cool.
"Nothing is impossible. You are only limited by fear and even that you can overcome."