Hmm, I'm more concerned wtih dust and lint traveling through the headphone and dock openings and ending up under my screen!
I could barely see the screen on my 1.5 year old Razr by the end of it's life....
I wish someone would offer a non-conductive dummy plug for both of these holes, like just a plastic bit you could stick in there to keep out the grime, or a case that has removeable covers...