10.10 doesn't provide much over 10.04 for a server, so people should wait maybe? I installed the 10.10 RC a little while ago on my primary machine but I am on 9.04, 9.10 and 10.04 on various other machines.

Yeah, I'd strongly recommend sticking with 10.04 LTS for any production servers -- unless you require a particular and/or peculiar feature in 10.10, that is.

LTS == Long Term Support == security fixes for 5 years. :-)

Except upgrading incrementally if you can is easier. Less things to change all at once.

Best of both worlds for server - upgrade from LTS version to LTS version only, skip the 'bleeding edge' *.10 releases.

Of course, plenty of people are still running 7, 8, and 9 servers with no problems.