i've been hearing it a lot latley....it's usally when i turn sharply and park on the right side only ( i hear the noise coming from the right side)....
it a noise like metal bending if u ever heard that, to hear it better in ur mind it sounds like my exhaust is dragging, and then bending across the ground...

if u can picture that in ur head...
anyways i think its the dust sheild bending on my axle or something when i turn, gonna check it out...but whats you .02?