Just a quick note. I noticed that CNN has a "quick-poll" on their website asking the question, "Do you have a personal computer in your home". I thought this was an interesting poll-question for a website! (Selection bias?) I know its not intended to be scientific, but I'm not sure how much it can tell us. Interestingly, 4% answered "no".
http://www.cnn.com/2005/TECH/04/01/cnn25.top.technology/index.html