I just picked up two rugged 4GB USB memory sticks at a rather good price of $15 each. ($19.99 less a mail-in rebate of $5.) Your readers might consider them for their emergency kits to store scanned in copies of their legal documents, insurance, investments and personal records and photos.
This isn't bullets and butter but might just prove more valuable than both when trying to get a replacement social security card or passport. The 10 year warranty is awfully nice so keep your receipt. Maybe you should scan that and save it on the memory stick too!
If your readers would also be interested in a free encryption software they should consider trying TrueCrypt for Windows, Mac and Linux. - Neal