Amazon Ties Blog Content into Site
It's an interesting attempt to bring the mass of information on the web into context with respect to making a purchasing decision.
I like this idea because one of the first things I do when I'm considering the purchase of a new product is go read Amazon's customer reviews. The second thing I do is Google for reviews of the product. Amazon is bringing the second feature closer to the first, moving closer towards being a true one-stop shop.
I'm not sure the relevancy of the content is there yet, but it's a variation of a personalization problem, and personalization is one thing Amazon does very well.