Expect the servers to be down for about an hour this evening.

EverQuest II has announced an unscheduled downtime this evening:

We'll be bringing US servers offline shortly to resolve some outstanding issues. The servers are estimated to be unavailable for approximately one hour

Holly Longdate, EQII Senior Producer, has been giving updates via Twitter. The latest said:

Servers are coming down shortly (within 20min). Downtime broadcasts are in-game also. Should be down for about an hour.

You can check EQ2 Server Status here.