Kmkplus iSlicker Protection for iPod Nano ( American Flag )
I just purchased an iSlicker for my Nano 8gb and so far it works very well.  It adds a minuscule amount of weight and thickness to the iPod. And to be quiet honest I welcome this slight change as the Nano is so incredibly light.  It looks great and KMKPlus have a wonderful selection of styles.  I have removed the iSlicker several times and it retains it's stickiness when re-applied.  Both the screen and the wheel are covered and protected with a clear window and I had no problem with either view degradation