Creative Vision M 30GB Video Protectective Silicone Skin Case with 15" Sports Armband / LCD Sheild / Belt Clip / Video Stand - 7 Color Options -
The zen vision:m is a bit bulky on its own, so I was just looking for something thin to protect it from scratches.  This was what I bought and it works great so far.  It fit my player well and keeps away all those unwanted scratches.  It's not going to do much in case you drop it, but I got a warranty from Best Buy so I'm not too worried about that.<br /><br />Also buy some kroo skin screen protectors.  You can get them here on amazon or at misticaudio.net.