If you have a Mac, and an iPhone then M.H.A. have the perfect application for you! Airlock is a bluetooth device proximity sensor, which once linked to your iPhone will automatically lock your mac when you walk outside of the predefined radius. Not only does this work on the iPhone but it even works with the iPod touch.
The clever people over at Polyideas have come up with this simple, straight forward little app for the iPhone. If you are regularly out of the office on business, but keep forgetting to set your out of office notification then this is for you!
LogMeIn have been making remote control solutions since 2003, over 70 million devices worldwide have connected to their servers at one point or another.