In keeping an eye on the Palm Pre news, I ran across this photo on Crave's coverage of Palm's Mobile World Congress display:
Beyond the uses Andrew Lim suggests, which are all well and good, the original intent of that mirrored surface is likely to help someone position the phone so that taking photos of themselves is a bit more reliable (much better than the tiny mirrored domes on so many phones these days).
What other uses do you think it might have?
To protect you from being mugged from behind!