That's right. It's here. I've been using the Beta 3 of Longhorn Server for a while now, and it is pretty darn stable - in fact, I've not had a single problem with it - admittedly, I haven't put too much strain on it, but the fact that a complete novice of Windows Server 2003 can have Active Directory Domain Services, a Domain Controller, DHCP, DNS and Windows Deployment Services up and running, and deploying Vista images in about an hour, seems pretty good to me! The reason I found it so easy was thanks to the Server Manager - It's undergone a bit of a revamp and it is very simple to use - even, like I said, for a novice like me. I suppose you would hope it would be easy to manage, seeing as one of the major pillars of Longhorn is "Increase Control and Manageability" :-)
With the launch of Beta 3, publicly, there has also been a plethora of information and documentation released to compliment it. Here, for your viewing pleasure, are the links that you need:
The final link I will give you is more aimed at our friends across the Atlantic...
Microsoft has teamed up with WindowsITPro to create a US Roadshow, where the team will travel across the States, delivering a number of one-day events, to give attendees a thorough understanding of what's coming in Longhorn Server. You can, if you are interested, Register Here.
The image is nothing to do with me by the way. I wonder if it will make the final design... ;-)
I'd be really keen to hear your feedback around Longhorn, or whatever the final name will be, so please let me know if you have any views and opinions on it.
Apart from that - enjoy it.