I wasn't going to get a case, but then I figured I'd at least want to protect the back.
(I have a 1G iPod Touch that is usually naked. Back is nasty, but there is not one imperfection with the glass.)
I ended up buying the iFrogz case. I really like it. Sold feel, Dockable and just plan nice. It did come with a screen protector too. It just sticks on. It really does give the glass a nice, slicker feel. Much nicer then just the plan glass.
Pic:
I just got the same case in blue delivered today from an eBay seller. Nice! Cool satiny feel with a velvet-like lining to protect the back of the iPhone.