Interesting article over at eWeek ... http://www.eweek.com/article2/0,4149,1455334,00.asp
The following quote makes me wonder about the “Simple” in SOAP ...
“In June 2002, Amazon made many of its Web services interfaces public as a software developer kit; the services provide access to the data within Amazon's entire product catalog and much of the functionality of the site used by both customers and merchants who sell through Amazon. The services can be accessed via both Simple Object Access Protocol (SOAP) and Representational State Transfer (REST), two XML-based Web services standards; Killalea said that about 80 percent of developers have thus far opted for the REST approach to building sites based on Amazon's services.“