Amazon Web Services 4 wrapper

Does anyone know of an open source wrapper class for the Amazon Web Services API (version 4)? The only ones I can find are either years out of date (such as Amazon_Services in PEAR) and so no longer work, or they require me to parse the XML myself. All I want is something relatively simple that I can give my developer token and a search term (99% of the time this will be the ISBN of a book) and get back a data structure (preferably an associative array) with the product information. Thanks in advance, Paul -- Rogue Tory http://www.roguetory.org.uk