XML.com
http://xml.com/pub
XML.com features a rich mix of information and services
for the XML community.
The Restful Web: Amazon's Simple Queue Service
http://www.xml.com/pub/a/2005/01/05/restful.html
Transforming XML: Extending XSLT with EXSLT
http://www.xml.com/pub/a/2005/01/05/tr-xml.html