Love 'em or hate 'em, Amazon has released a querying service, but isn't using SOAP.
The Amazon approach (Associates account required) is very different, relying only on a simple XML vocabulary and queries built on HTTP GET. While intended only for Amazon Associates to build more sophisticated catalogs, it offers a similar level of information to Google's offering.Perhaps if this takes off, Google will resume or expand a simple service like this one, in addition to it's new SOAP API.
