All my nokia chargers, from old 3.5mm to n900 whine.
I haven't heard n900 speakers make noises when gsm radio is active though, my older nokia phones all do that.
My N800 makes an extra higher pitched noise over the already high noise floor when the touchscreen is touched. The backlight seems to vary in brightness at lowest setting depending on sdio activity...

When you open your ears and eyes you'll discover that everything makes noises or flickers these days