An iPad is not in danger of replacing my PC, I completely agree with Apple's proposition that it's a third class of devices.<p>I won't program on an iPad. I like the look of iWork, but I can't see myself composing my next presentation on it. I won't be (legally in Canada) ripping my DVD collection on it. I might write comments like this on it, but without a stylus I can't see myself writing a blog post on it.<p>An iPad may replace my mother's Macbook. And it ought to. She surfs the net, writes email, does her banking, and skypes. She has no need of a device that she can tinker with.<p>I see iPads as a threat to books and also as a threat to secondary televisions. The big screen isn't going away, but a lot of people like a smaller TV in their bedroom or kitchen. Being able to watch movies and favourite shows on a small device may displace these extra televisions.