I see that Longhorn now has a proper name... it is Windows Server 2008. Everyone sort of knew it would be called Server something - the only reason to hold this up must be that they didn't know which year to release it :)
Anyway, I'm looking forward to seeing it in action on our network, in maybe a couple of years - I am sure we will have a new server by then!
And if you want to know how they came up with the name...