Snapanda

This is a great little tool that I've just discovered.  Haven't been able to try it out yet, as it's only for Android phones currently, but they are working on an iPhone version, so hopefully it won't be too long.
This is a free dictionary App, but with the twist that you just show the word to your phone using the camera in it and it will look it up for you.  Here's the promo video to explain better.