TOOGOO Purple Rubberized Hard Case Phone Cover for Apple iPod Touch 4 / iTouch 4th Generation
I was looking for a case to protect my new toy from nicks, dings, etc. and that's exactly what I got.  Easy to put on, easy to hold, a little harder to take off.  I paired this case with a heavy duty screen protector and now I'm all set.  My only word of warning is that if you like to take pictures with you're ipod, you'll need to clean the lens first.  The indentations that allow the camera to show through also collects a lot of dust, but I'm sure that's par for the course for hard cases.