A better method of not voiding the warranty is to call and complain to AppleCare. AppleCare has a branch known as customer relations that takes all feedback seriously. Keep a case number open until your situation is resolved. Just call once a week.

All,
I posted a (the) reason for the whining noise on a Mac board. The noise you hear is from the speed-step technology built into the Intel chips. Basically, the voltage and frequency of the chips are scaled back when they're not being used. This causes the electrical noise you've been hearing. Think of it like a dimmer switch on a household light. If you listen closely, you'll hear a noise from them as well.

The problem gets worse with more power-saving technologies. Several network chips make the same noise, and there is no resolution for them at all. At least with the CPU's (on non-MacOS OSs) you can usually disable the powersaving features of the CPU and other devices to make the noise go away.

I'm sitting in front of my MBP now and the only whining I hear is these people whining about the sound. My MBP (serial number W8610xxxxx) makes even less noise than my old first generation 1.5 GHz PowerBook 15". It does get very hot, though.

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"This is nothing malicious and we do it with the most admirable of reasons - telling Apple we love their characteristically high quality and won't settle for less. Since we pay for the ability to call technical support when have an issue, we should use it."

So what's going to happen on that day when there are hundreds of other non-MacBook protestors trying to get their critical problems fixed that day. Is it enough to tell them that "sorry you lost hours of your time today, and didn't get the service you needed, but we had to make a point."