I've been playing with it on a separate partition - I'm not ready to install it on my Cube yet.
I like it a lot, but as always, things are hidden away here and there. They consolidated a lot of things into the Workgroup Manager. There are still some things I haven't looked for yet, but I had it on my Windows network in under 5 minutes. I want to have it as a domain controller, but that would mean different prefs on all my computers which I'm not sure I want to do yet.
Let me know if there's anything specific you need to know.
Mike