Very good point.
Furniture, books, food, computers, and clothes are others that retain their value or use, IMO.
Furniture is pretty natural. You need a bed to sleep on. Other things like bookshelves are nice, but not completely necessary like a bed would be. Large items like desks and entertainment centers are virtually worthless in hard times. Even in good times, there is little they can bring in.
Books, the right ones, always retain their value, especially if they are ones for engineering, math, and science. Literature is nice too, but not a necessity. I'd definately have around first aid books and others that you would find necessary (mechanics, cars, fuels, building (something), diseases, electricity, and maybe computers). You can always find a use for them (either selling or using them yourself).
Food...not too hard. I wouldn't put too much stock in meat, especially expensive ones. But grains, wheat, rice, fruit and veggies are great. Anything that will last a good bit of time is always worthwhile especially if they don't need refrigeration (noodles, rice, etc).
Clothes...same thing as food. You wear them.

I'd stock up on some good quality clothing. Contrary to what many think, they do last a while. I've been wearing the same shoes for 4 years now and they still get the job done although they do show their age. And these are cheap ($40) Chinese shoes. Expensive clothes will definately not retain their value, but will be useful as long as they last a good while.
Computers are always good to have around. I wouldn't go out and get the latest edition $2k one, but you don't even need them. It's amazing that people buy junk like that. There's very little difference (other than software and use) between the $300 one and the $2k one. You can get a 2.5 gigahertz, 80 gig harddrive with a CD burner and 256 Meg ram with a printer for $300. The $2k one will be only marginally better with 'better' software which you would probably hardly use.
I want to put out the fires of Hell, and burn down the rewards of Paradise. They block the way to God. I do not want to worship from fear of punishment or for the promise of reward, but simply for the love of God. - Rabia