Thanks Mark. An updated on the status of Longhorn Server has been published on the Windows Server Division WebLog:

We're planning to kick off a Customer Technology Preview (CTP) program to coincide with Beta 2, which will arrive in the second quarter of this year. That means all MSDN and TechNet subscribers will be able to download it and start playing with fun new things like Network Access Protection, Server Core, IIS 7.0, Terminal Services Gateway and Remote Applications. You'll also get to pair it with Windows Vista to see the performance and reliability improvements we've made in our completely redesigned TCP/IP stack.

Where's My Longhorn Server?