I don't have much to offer here, except:
I keep as great a distance from potential rock throwers as possible, especially 18-wheelers, commercial duelly's, etc. I don't know if this has saved me, but I'm avoiding any serious thumps so far.

My hood deflector has no known functional advantage in deflecting anything, as far as I cantell, although I didn't care about that much, as it looks really nice and everyone says so.
The bugs drive me crazy, since Oklahoma seems to be the galactic center of the freakin insect universe! I found a nice window washer that has a telescoping handle on it to use when I get gas because I am short and the standard washer at the pump doesn't reach far enough across the windshield. I just keep it in the back and use it for the top 20 pounds of bug-flesh I receive from driving across town!
Hope this helps someone!