I am glad I came across this post - my ibook has just started smelling - after 2.5 years. It has taken me a while to figure out that it is the keyboard and not what is underneath it. I can only describe the smell as being similar to the spice 'cumin'. My mac friends agree it smells like cumin. Very bizarre and very noticeable. My mind is put at rest that it is safe thanks to your message. I guess I'll just have to put up with it! Best Nikki