Every once in a while I will get a squeaky key. It goes away after a while. I tend to just forget about it and it's gone.
I remember when my space bar started squeaking... I took the whole thing off and I couldn't figure out how to put it on. I finally put it on, but it was on wrong... and broke a piece off of the actual keyboard (underneith) the key.
I had to get a whole new keyboard. Apple was cool about it.
Anyways... that's the last time I tried to fix a squeaky key.