CindyAE from AE on the Verge has come up with two great posts chock full of travel tips she's gleaned (the first is here). As someone who tends to lose her car regularly, I particularly like this one:
If you carry a digital camera or a cell phone camera - take a picture of the sign nearest your car in a parking garage; the nearest street sign/building where you park your car; or your hotel room number. Then you can refer to your camera/phone if you can't find your car/room later.
Another good one for the linguistically impaired traveller:
Create a "photo album" on your cell phone of pictures of basic things you may need when travel to foreign countries. Point to picture if don't know the foreign words.