zCover micro2 Tough Case for 2G iPod Nano ( Black )
Protects the nano very well.  The cover over the scroll wheel protects it but does not hinder operation.  Plastic cover over screen is clear enough, except if trying to view w/ polarized sunglasses on.  Comes w/ clip that works well but I would not leave it on all the time, it left a very faint change in color on the back of my nano, though most people would probably not notice the color change.  All it all it does what I wanted very well, protect my nano well enough that I can just throw it in my book bag 