1) Whole different way of thinking about buying books:
Sitting on the airplane at Newark airport Friday afternoon, getting ready for the 13-hour flight to Beijing. People are still trudging aboard, still OK to talk on the phone, chatting with a friend who mentions a great new book he's sure I'll want to read. While talking with him, I take out the Kindle that I got three days earlier, search the Kindle online store, find and buy the book, have it delivered to the Kindle to read during the flight -- all within about two minutes total. Huge reduction in the gap between "thought that a book might be interesting" and "paying money for that book." Works only for books in the Kindle catalogue, of course. Implications not so good for book stores but positive for the overall industry of selling ideas / thoughts / writing, I would think.
2) And about not buying books:
Giant supply of books for free download, in Kindle and other eBook formats, here and here, among other sites. They're mainly out-of-copyright classics, from Ulysses to War and Peace to Huckleberry Finn to Persuasion to Looking Backward to The Oregon Trail to Anne of Green Gables to the Complete Works of Shakespeare (and many by PG Wodehouse). Plus a few new ones. Small donations solicited here. In most cases you download to your computer and transfer to Kindle via USB cable, which is extremely easy.