Hi,
I have seen in closed tickets about this due to Amazon licensing terms. I guess we are dealing with this:
https://affiliate-program.amazon.com...=assoc-api-faq
In particular, it states:
"You will not use the Product Advertising API, Data Feed, or Product Advertising Content with any site or application, or in any other manner, that does not have the principal purpose of advertising and marketing the Amazon Site and driving sales of products and services on the Amazon Site."
It seems that they do not have an "informational" WS, but an adveritising WS, that is in fact the new name of the API.
However, what about using html scraping?
For example, retrieving http://www.amazon.com/exec/obidos/ASIN/{ISBN} returns details of a book, including title, author, cover, isbn and abstract.