Subscriber counts: If you were curious how many other subscribers a feed that you read has, you can now easily check: use the "show details" link in the top-right corner. Additionally, to see how indie/hip you are, you can use the "Most obscure" tab on the trends page to see the feeds that you subscribe to with the least number of subscribers. Just keep in mind what these numbers indicate.
Increased reading area: By shuffling some things around in the header area, we've managed to squeeze an additional 17 pixels of reading space for feed content. This may not seem like much, but every little bit matters when consuming hundreds of posts a day.
Bug fixes and performance improvements: We've made Reader faster to load when you have more than a thousand subscriptions. The settings page should feel perkier too. Finally, we've squashed some bugs -- most notably, bugs that prevented profiles from loading in certain cases. We also added improved keyboard navigation and fixed a problem refreshing search results. A lot of these tweaks and bug fixes are in response to user feedback that we get in our discussion group, so please keep it coming.