Thanks for the link, Tiersten. I wonder why they don't advertise these features more. I found more info on the new Kindle for Web on the Amazon website too:
http://www.amazon.com/gp/help/custom...deId=200528580
The Kindle for Web works great on my Mac. I am using Safari as a browser. Apparently Amazon just wants us Mac users to work harder to buy the Kindle edition. It would be nice to see a Buy Now button on the non-Kindle book edition like I can see on the PC.