Well in a quiet room I can hear it, but that's expected. You need some air moving through the darned thingWow, thanks for the great response! Please keep it coming.
I'm surprised by the vast majority of people who said their MBP is dead silent! Is this the case even in a quite room when you're sitting right in front of your MBP? I can definitely hear a low hum/whirr with mine in this situation so I guess mine may be a bit abnormal.
You download the CHUD tools from apple's site. They're free for anyone to download.How do you shut down cores? I didn't know you could do that. Does it save much power / extend the battery life?