Identity theft and general info-sec is obviously a concern, but the way I see it, I either trust someone to safeguard these details or I don't.
I can try and minimise the chances of the document being compromised. I briefly considered some sort of encrypted flash drive business, but I figure a hard-copy subject to physical security measures is probably a lot safer than something that can be drag-and-dropped onto a Windows Vista desktop. I can also minimise the amount of personally-identifying information in the document, so anyone obtaining the document without context wouldn't know who these various assets and policies applied to.
My plan is to produce two physical documents and give them to two geographically-disparate immediate family members for safekeeping.
A safe deposit box is probably worth the cost.
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