And it's not coming from Teh Basement

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Anyways, noticed it tonight for the first time, and it's very peculiar. Coming from about the middle of the engine bay, I get a strange whine that's RPM dependent. It's doesn't fluctuate with the amount of throttle, as would an exhaust leak (Which was my first guess, due to the pitch of the noise), and is independent of the rotation speed of the wheels (Not a wheel bearing or something like that).
My car was warmed up when I first noticed it, so I don't think it's some random cold-start noise... and I certainly hope it isn't because of the oil level... I had it changed 2 days ago at the Honda dealership (I don't mind paying some guy $13 plus parts to change my oil... I hate putting my teggy up on jackstands).
I'm gonna do more troubleshooting tomorrow morning when the neighbors wont call the cops on me for revving my engine to 3K for a couple minutes... any trouble spots that I should look for that could cause an RPM dependent whine from inside the engine bay?
I actually think it might be my AC compressor... :dunno: any ideas?