I was just about to /mywrists today when I found this post. I wanted to post to this blog to say thanks to SteveX for posting it.
I was trying to read a web.sitemap file in as an XML doc and work with it. I was screaming at my screen that I KNEW there were nodes matching my XPath (//siteMapNode) but it always returned 0 nodes.
Thanks again to SteveX for savin' my life. :0)
~L