I was notified today by Rackspace that my web server cluster will be experiencing an outage tomorrow, Saturday March 3, 2012 between 12:01AM and 1:30AM CST. Per their message:
The maintenance window is scheduled for Saturday, March 3rd from 12:01 AM to 1:30 AM CST (06:01 AM to 7:30 AM GMT). In order to minimize impact, we will be shutting down the affected servers. Once the maintenance is complete, these servers will be brought back online. This entire process should be completed by 1:30 AM CST on Saturday, March 3rd.
Sorry for any inconvenience this may cause for those of you in other parts of the world. Hopefully everything will come back online OK after their window is complete.