Yup, that would be a good selling point for Amazon for the platform. And the more hardware is sold, the more the whole Kindle store service would also be used.
An ebook optimized and personalized access to Google News, maybe developped in cooperation with Google to provide the news providers with ebook optimized advertising as a monetization would be nice. For example the ebook optimized ads could take the bottom couple of inches of the page. As well as micropayments integrating so reading one article ad-free through Google News could cost just $0.01 for example.
And the open RSS aggregator could have a huge potential also. They could display feeds in a personalised way, suggesting blog posts and suggesting feeds using the Amazon recommendations algorithms. But also displaying feeds in the same kind of river mode as Google Reader. And integrating that also with Google Blogsearch to read other related blog posts from around the web.