If we assessed the popularity of requests in the WordPress.com forums for new features, Sphere would probably be in the top 10. (By the way, the feature most requested on the forums is AdSense under the control of the blogger.)
Well, WordPress.com just got more spherical. The new possibly related posts feature uses Sphere to generate links at the end of a post.
If we find any posts on your blog that are related, we’ll put those at the very top and in bold. Next we’ll show other posts from around WordPress.com, and finally we’ll check if there’s anything in the mainstream media.
Visitors to your blog won’t always see possibly related posts. The links don’t show up on the main page of your blog, or for posts when Sphere can’t find related posts. You can turn the feature off entirely. Matt says that the feature will be tweaked as feedback and other data come in.