Google Reader's settings page has a new section where you'll find "experiments you can choose to opt-in and try out". It's like a small Google Reader Labs that only has a single experiment you can enable: smooth scrolling. This feature makes the transition between items smoother and it's especially useful in the expanded view.
While this feature is more difficult to find, you've probably noticed the colorful ball that's displayed when Google Reader loads new posts. The animation is one of the few colorful elements from the new Google Reader interface.