Mine does exactly the same thing. But, it took me a long time to figure out it was the seatbelt buckle receiver making the "creaking" noise.
While I have not permanently solved the problem, I can silence it by simply moving the receiver on its pivot. Somehow, changing its position - even slightly - stops it from making noise.
This may be too obvious (which makes me wonder why I haven't tried it myself) but, has anyone spritzed a little WD40 into the joint where the receiver is bolted to the seat-frame? (Or is that what cdm2 meant?) I think that's where the noise originates.
[ May 16, 2001: Message edited by: Leader ]