I can see your point, but slightly disagree.
With the technologies covered being relatively new and many organisations not using all of the available functionality, a lot of the knowledge can either get forgotten or just never be required in the first place. I think there must be a lot of people moving from 2003 to 2008 at the moment and without a bit of research/training its hard to see how you could fully understand the changes.
I dont like the boot camp method though, MS Press books, CBT nuggets videos, and some virtual machines for me.
Hope that makes sense, I'm absolutely knackered today...