We have just published a new tutorial document, "Chained Requests Using XSLT." The technique illustrated in this document allows you to execute a sequence of AWS requests under the control of a script written in XSLT.
Excerpt: This tutorial walks through creating a simple two-page web site that uses chained requests in XSLT to display data from multiple web services operations in a single page. We’ll be starting with an ItemSearch operation looking for Amazon Listmania® lists. Using the first list returned, we’ll use a ListLookup operation to get the list of items within the list. Then we’ll use an ItemLookup operation to fill in some additional item property values.