So I finally got some time to try this ... my results weren't what I expected.
I created the file, but had to provide input in order to move to the next page. If it's suppose to be unattended, doesn't that mean I can boot it up and walk away... and the file provides the answers to all the input areas? I expected it to move along while I enjoyed a Sam Adams Winter Lager

... but it didn't!
I used the books reference answer file, but found a reduced one on the MS site. Below is my xml file ... Basically I configured it to created a 100 GB partition and install the OS... I was dissappointed when I got to the product key selection and just clicked next without entering anything, but it was ok...and moved along. It also set my home page to the what I provided in the file, so its reading the file... but why did I have to select next on all the prompts ... I was figuring I would just tap the space bar on the initial "boot from DVD / CD" and it would run the course after that???
Can anyone tell me what I am missing?
Thanks