Speck Fitted case right now (the green striped one). Freaking love this case. With that, the phone gets carried in an interior pocket in my purse with papers and other non-scratchy stuff. Even if there's nothing in my jeans pockets, I'm hesitant to put it in there as my 3GS sustained a teeny scratch that way (it was like 1.5 mm long and was only visible when I was looking for it, but the fact that it was there in the first place drove me NUTS. I still don't know how it got there; it was fine before I stuck it in my pocket--which was empty--and the scratch was there after I took it out. Grrrrrrr.)