Turbine let us know that all of their games will be down tomorrow morning:

The Servers will be down on Thursday 1/22/09 From 5am - 9am Eastern for maintenance. During this time all worlds will be offline in order for us to run diagnostics to determine the cause of recent downtimes.

Forums and other official things may be offline as well. Hopefully they can find the cause of these downtimes - it's been affecting all three games!