Google Reader released a new feature "fullscreen mode" that let you maximize screen space whenever possible. You can toggle the fullscreen mode through the 'f' key'. Additionally, you can use 'shift + u' to show and hide the navigation panel so you can easily change what you're reading without leaving fullscreen mode.
"Also, added a new category to the trends page: "clicked trends" that show you which sources you click on the most. And finally, Google Reader now show you your lifetime read item count i.e.*Every. Single* Item – Note: Only things you've scrolled by, or clicked on - doesn't count mark all as read. Or, once you hit around 300K we stop counting for performance reasons," informs Google.