Originally Posted by sonus
It sounds like the same kind of whine that some cars make when you're stressing out their power steering by turning when you're at a standstill or cranking it to the stops.
This is exactly how I would describe the noise. I notice it mostly in second, at ~10 mph, say if I'm creeping through a parking lot looking for a space. I really wish I knew what it was, because it bugs the heck out of me.
On the other hand, if so many other people have noticed the same thing, maybe it's normal...