Hey guys.........the issue with the whine noise is related to the Core2Duo CPU power saving modes. When system conditions allow, the CPU cycles itself down into the C4 mode. This transition between C3/C2/C1 states and C4 state is what we're all hearing.
Some humans can't hear at this frequency, but most can. Anyone remember the hype around the "Bee Ringtone?" It's roughly at that frequency and some folks just can't hear that high up there. I'm one of the unfortunates that can.
Macbooks have been experiencing this issue too and the fix is to install a kernel module called "ShhMBP." This module completely disables the ability of the kernel to allow the CPU to drop into C4 state at all. I've not really noticed any reduction in battery life, but then again, I'm just peachy that it works.
Now I only wish my XPS 1710 had the same fix for Vista!!!!!!!!!!!!!!!!! That's what's needed though, to disable the friggin' C4 power saving state of the CPU.
Hope that helps a bit. Google it, and search at Intel's website for the various power states.......it's all there.
***EDIT -- To clarify, the power saving modes are really called "Sleep States", according to Intel. And the C4 mode that's making all the noise is called "Deep Sleep." I think there's another state, C5, but it's not been enabled in the hardware. I don't know.......I'm not an engineer, just a geek like everybody else here.