I did a quick search, but I didn't see any mention of this, so I'm going to go ahead and throw it out there.
I feel like the volume up / down buttons need be reversed when in landscape mode. Currently, you still need to push on the left side of the button, but the on screen graphic moves to the right. Correct me if I'm wrong, but this should be an easy software implementation.
It's only a minor inconvenience, but it seems that it would be more intuitive if the buttons were switched (when in landscape mode only).