This really is a "to each his own" kind of question, but I do think it is legitimate. Each of us can imagine the differences among the different forum participants -- for example, someone might find it more relaxing to whittle, and wouldn't know what to do with a Playstation 2 if their life depended on it. Us city slickers are more accustomed to external entertainment than using our imaginations. So the need to be prepared for any emergency should include the need for reducing stress at opportune moments. To that end, I will add my $.02 to Benjamin's question.

I think that dual-use things are quite appropriate here. The survival playing cards is a great example, as is the radio, as they both provide information and entertainment. I would also include (and I know this will get some snickers) extra condoms if your emergency situation will include a significant other. If anyone has ever seen the episode of MASH where Hawkeye and Hotlips are trapped in the shelter while the bombs are falling, you'll know what I mean. Close proximity when sharing warmth, stressful situations, and/or fear of losing loved ones are great for generating a need for distraction, and passion fits the bill quite nicely. You might as well prepare for it. Those with kids should have small travel games and books ready to go.

People who enjoy the "bushcraft" activities described in other responses ought to include the items necessary for that activity. Why not? If braiding cord helps you relax enough to refocus, then go for it. If knitting works for you, then include a small pair of needles and a ball of yarn (BTW, I can think of dual uses for those, too).

Bottom line: do what you need to get through the situation. If you need toys, hobby items, whatever, to keep from going crazy in a crisis, then include them in your preparations.