Does the MacBook Pro fan constantly run? And a note about the whiney noise [Update]

I have a minor dilemma, folks. If you remember, I reported on numerous problems with my MacBook Pro, some of which Apple acknowledged, some it didn't.

I'm having a new difficulty: the left-side fan of the machine is constantly running, non-stop, from the moment I turn on the machine. The Apple Store Geniuses continually tell me this is "normal" and "within Apple parameters," but I can't seem to remember my pre-replacement MBP sounding like a small aircraft auditioning for a spot on O'Hare's runway. So I ask you, dear MBP-owning readers: Is the left-side fan on your machine always on, making a sturdy and constant whooshy hum?

Oh, and one other thing: While the Genius was "testing" my machine in the back room, I glanced at his PowerBook's screen, which was open to a page diagnosing MacBook Pro problems. It mentioned the infamous processor whine, and described it as a problem with an internal component (obviously) and listed various serial numbers affected. It also -- brace yourselves -- seemed to indicate that the problem was fixed, and could be fixed on affected machines. The Geniuses seemed to be trained to tell you the problem is "normal" and a fact of life, but this page said that it certainly could be fixed by a replacement part if, and I'm paraphrasing here, the customer deemed the noise to be 'unacceptable' and threatened to return the machine. So, if the processor whine bugs you, just go to a Genius bar and demand a fix -- they'll probably oblige.

Update: In response to the 1,435,987 questions all asking the same thing: Yes, I am 100% positive the page I read involved the processor noise and not the LCD, because right above that paragraph about the whine was another paragraph describing the LCD inverter problem. They are two very separate issues, and I do -- despite allegations to the contrary -- understand the differences between them.