Anyone switch from 2000 or 2003 to 2007 yet?

I've just installed 2007 but have not yet transitioned all of my mailboxes and public folders over yet. I have some more configuration and baseline performance stuff to do before I make the leap. Not to mention, I'm coming from 2000 to 2007... I should have taken a class.

I'm going to stop by the local borders on my way in to at least pick up a book. Things have changed quite a bit since 2000 and 2003.

I'm ok with 2000 and 2003... but I have no idea how to use the power shell yet... and aparently, the GUI is built on the power shell and as usual, the GUI team didn't complete the GUI because of a rush to get this product to market. Mind you, I'm not afraid or opposed to the shell... I just have to learn how to use it.

What are you initial thoughts on 2007?
Is a transition/migration in the works?

I'll tell you one thing... I had to do a LOT of freaking work just to be able to install 2007. Not only that... some products don't even have full support for 2007 such as blackberry or some backup software. They have workarounds... but we all know how that turns out...

This should be quite an interesting project...