Been reading articles on drupal.org and fiddling with an install on my dev box. It's slick, fast, and flexible. I'm sold.
Now all I have to do is figure out how to use the Path and Taxonomy modules and I (might) be on my way. The book I ordered should be here tomorrow or today.
@mike_m - Could you PM or email me the URL for the company you're referring to? I'd just like to see what they work on.