I first put on a screen skin from BestSkinsEver. I used them before for an old BB and was happy, but I gotta say, this one didn't go on smooth. And in my pocket with keys, the screen looks all wretched now. I ordered a new "thin glass" screen cover off Ebay now.
Also, I put on a silicone skin from ebay. I was surprised actually at how well it fit. And it's the right blend of smooth and rubber. Smooth enough to slide into my pocket, sticky enough to lay on my centre console in the car to act as a GPS. Here's the link.
And yes, due to the sheer size and weight of this phone, I can't imagine going very long with no protection.