Back in the old days, whenever you bought a wallet, there was always an "In Case Of Emergency Card" for you to fill out. Well, my wallet is pretty old and I ran accross this web site that has a link that you can type in your info and print it. You can just cut it out and laminate it afterwards if you want. Might prove helpful if you don't have that information on you:
http://www.sheriff.org/safety/ice.cfm (http://www.sheriff.org/safety/ice.cfm)