Visiting amazon.com today I was greeted by a new feature Amazon is introducing to their customers, called personalized blog - a Plog:
["Your Amazon.com Plog is a personalized web log that appears on your customer home page. Every person's Plog is different (hence the name), and the posts are sorted so the most recent entries appear at the top. Each post also gives you the opportunity to provide feedback to the sender as to whether you liked the post or not. ... Posts in your Plog come from many sources, including authors of books you have purchased on Amazon.com. ... In the future, your Plog also will help you discover products that have just been released, track changes to your orders and much more."]
It really looks like a feed aggregator, aggregating posts from, let's say, book authors, which you searched for, bought their books or are somehow connected with your interests you expressed on Amazon. You also have the option of commenting and rating the posts [like/don't like] to give some feedback to the author. This could really develop in a nice feature for book readers to stay in touch with the latest activities around the books they purchased [like revision, source code updates, reprints], as well as keep informed about the author's latest works.