I have had several laptops, and at least three keyboard problems in my long experience with Apple.
* The first one was with an iBook, which I ruthlessly spilled a full bottle of mountain dew into its keyboard. Surprisingly, soda on the mainboard doesn't cause much more than a completely unreliable keyboard.
* The second keyboard problem I had was with another iBook. Something foreign got under a key (W, I think), which caused the key to perform in the manner you describe. On that model I could remove the keyboard and pound it on a hard surface to clean it. On new laptops, that just isn't an option. Canned air just might help. Maybe.
* The third keyboard problem I had was with a Revision A MBP 17". Without warning, the Z key stopped functioning. Apple replaced the keyboard, no questions asked.
In all cases except for the last one, foreign objects caused some real odd behavior with my keyboard. I include the mountain dew case more as a joke, but even then, having something in the keyboard caused behavior that I didn't expect.
One thing I noticed when the third keyboard problem occurred is that the keys are very stiff for the first few weeks. It was that way when I bought the laptop, and that way again after Apple gave me a new keyboard. The keys do loosen up -- perhaps dependent on how frequently you type.
If it really bugs you, call Apple. They'll probably replace it.
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