Doug -
I have the clear Agent 18 iPhone shield, seen here:
http://www.agent18.com/scripts/prodview2.asp?idproductpages=21 and a clear "film" on the touch screen. I keep it in left front pocket, too. This was a switch for me from my old phone, but I want to avoid the rivet in the right pocket of jeans, so I've made it an always in the left pocket rule. I have dropped it. It's wider than my old phone and doesn't fit in my palm all that well.