I gave a presentation at my local CFUG yesterday called 10 Underrated Functions in ColdFusion, I plan on doing one for tags as well at some point. Here was my list of functions, in no particular order:

ValueList - Returns the contents of an entire query column in a string list.

I wrote a web based XPath tool in ColdFusion. The tool will allow you to perform an XPath query on a XML document, it then highlights the results and also dumps the XmlElement returned from the XPath query.

Well thanks to Sean Corfield I understand why I was having issues with namespaces when trying to parse RSS 1.0 with XPath.

If you have a document with namespaces such as RSS 1.

I came across a handy reference article on xml.com today that gives XPath queries for RSS and Atom feeds. Just last week I was attempting to parse a RSS 1.0 feed in CFMX using the XMLSearch function. I'm running into problems however due to the name spaces in RSS 1.