As I recall, there is something in the owners manual about (humming) noises when the car is shut off and that it is normal. It's the fuel system purging itself periodically.
And as mentioned, the HID's make a humming sound too.
Yep, that's what it is. My GS does it and my mothers X3 does it as well, its normal there was a discussion in the 3GS forum thread on this. I'll see if I can find it.
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