Here's a neat tip I found on the 43Folders Wiki:
Every 6 months or so, I photocopy anything essential in my wallet and file it away. I photocopy my credit cards, ID, HMO membership, llibrary card, etc. (I skip the burrito punch cards.) Copy both sides. This way, if my wallet is lost, I know what is missing, and I've photocopied the phone numbers I need to call to cancel the credit cards, etc.
They have a great wiki for
They have some great ideas in there, if you have some of your own, be sure to add them!