I was just watching BBC siene and saw this application (or gadget) used in one tv-show. Wikitude shows information about the surrounding where you are, so it's very useful for travelers. One "problem" is, that sometimes it shows places wrong or things that doesn't excist anymore, like WTC in NYC..
Maybe Wikitude is last years thing, but I didn't know about it. Maybe it's because I have a cheap Nokia. I want to get to use these useful gadgets! I have to get an iphone!
Check out Wikitude
Wikitude Augmented Reality: WTC - Its not there but its there from Wikitude on Vimeo.