I have a friend whose house1 burned down a few years ago. He and I are both baseball fans and I'd lent him my copy of Robert K. Adair's The Physics of Baseball before the fire. I never saw the book again, and wasn't going to bother him with such an inconsequential item when he was trying to replace all the really important things he lost. I've since replaced it with a newer edition and he's now living in his new house.
Since that happened, I've worried about what I'd be able to replace if we had a disaster, mostly because I wouldn't be able to remember everything. Normally, I suppose, you'd make a long list of the stuff you own, file it with your insurance company or put it someplace safe. But there's a much faster way: just take a digital picture of everything, burn it all to a CD or DVD and file that away. We've got a reasonably inexpensive 3.1 Megapixel camera, and I just took a couple photos of one of my bookshelves. The book titles were too hard to resolve when I took the entire bookshelf with one shot, but you can easily read everything at full resolution when only a couple shelves are fit into the frame (that's what the image above is a sample of).
A few minutes with a camera and I'll have a nice record of all of it.
1 Google as an English language expert: I couldn't remember whether this phrase was "who's house" or "whose house". A google search for the first phrase yielded 76.7 thousand hits. 'whose house' is almost ten times more popular (737 thousand), so I figure that must be correct. To confirm this, I repeated the search, adding 'site:http://www.nytimes.com' to the search string. Two hundred and ninety-five hits for 'whose house' at the New York Times, zero for "who's house". Case closed.
Also: the new version of Firefox will spell check text entries like the big textarea I'm typing this post into. Goes a long way toward eliminating spelling mistakes in blog posts. Check it out!