Android, as a platform, has an advantage in that apps designed for phones scale to tablets dynamically, so many are functional without a proper tablet interface. The disadvantage? Some developers take their sweet time making said tablet interfaces. Twitter, for example, is still a giant, stretched-out version of the phone app. Enter Plume, an app that sticks much more closely to the ICS design style guide.
While adhering to the style guide may not always be enough to make an app great, Plume provides a highly-customizable UI that makes use of the best parts of Android's new design elements.