I know people have been hoping for this for a while - Amazon's web services now provide CD track listings.
From the SDK (Section 2.3): "When the user does a heavy search that returns a music product, AWS will return the track listings if we have it in the DB."
On a similar theme, the 'international prices' page for blaxm! and Amazon Browser now uses the Amazon UK web services to display UK as well as USA prices (although the server is a bit unreliable about whether it actually sends prices at the moment). Disappointingly, the customer reviews and 'related items' don't seem to be divided by locale.