This John P. Falcone/Webware article does a good job of providing a preliminary evaluation of the new Amazon Kindle reading device:

The Bottom Line: With its built-in wireless capabilities and PC-free operation, Amazon’s Kindle is a promising evolution of the electronic book (and newspaper, and magazine)–but overpriced content could be its Achilles’ heel.

The six-minute Amazon video on the Kindle is here.
Update: The WSJ’s technology reviewer, Walter Mossberg, is not particularly impressed after using the Kindle for a few days, while the Chronicle’s excellent technology columnist, Dwight Silverman, is a bit more optimistic, but not yet sold.