Quoting: WordPress founder Matt Mullenweg announces two new features coming to WordPress.com (the company’s hosted blogging platform) this week: search and related items. While Mullenweg is sparse on details, he says of the new features (at approx. 32:10) “you have to analyze the text and find the most relevant things … across more than 4 million posts per month.“
I love the idea of being able to search across all WP.com blogs. That would be great and lead me to blogs I haven't encountered before.
I'm not so sure about this Related Posts stuff. I hope it's optional. I have a nightmarish vision of some damned popup occurring when someone is reading one of my posts. Something like that awful Snap! popup.