I tend to wear Hawaiian shirts--and the Kindle 3 fits in my shirt pocket just fine. There are not a lot of books, even paperbacks, that do so. Right now, I have dozens of books loaded into my Kindle that I can read if I ever stuck in a car repair shop, or a doctor's office, or any of a number of different time wasters. That's kind of neat!
By the way: if you are going to be buying something from Amazon.com anyway, if you use a link to the product on this blog, or the Amazon 2.0 Search tool on the right side, it puts a little money in my pocket, without increasing your cost at all. While Amazon.com is not always the cheapest store on the Internet, they are often the cheapest, or at least very near the bottom.