I have a new article that was recently published at Community MX titled Use XML to Populate Dependant Select Lists.
“Nearly everyone has seen the classic Dependant Select Lists. It’s a great user interface technique where you have two or more select form elements and the selection of one list changes the contents of the next list. This is commonly done with City and State selection interfaces. This tutorial will demonstrate how to build Dependant Select Lists and populate the lists using an XML data file.”