Check out this concept travel tool - Maptor!

Here's a way cool product that's yet to hit the market, I think.  Maptor.  It's a little gadget that you can hang around your neck or carry in your pocket.  Then you point it at a wall, on the floor or even some chick's booty and press a button - BOOM, you have a real time map.

There was a ton of buzz about this product in 2009 but I haven't seen it come to the marketplace just yet.  I would pick one up myself if the price was under...errr...let's say $250.  Anymore than that and I'd lean on my cell phone or the GPS in the car.  This travel accessory is super cool, but not 100% necessary.