OK, I'm not a gadget addict, but I know how awfully it could be if you are standing in the middle of nowhere with a bottle of beer you are craving for and no opener is in sight. Some guys are pretty clever using everything they can get to open a bottle. I saw a show on telly where 3 candidates had to open a crate of beer bottles by using the things the found at the room. Each bottle had to be opened by another item. They basically used knifes, tables, newspapers, and whatever they got in their hands. Pretty amazing.
As I'm not a kind of bottle open technician I got one of those micro bottle openers which is kept on the keyring. You want open thousands of bottles with it but at least you have it always with you. Another thing you might have with you is your mobile phone. Or nowadays an iphone: