Emails have gone out to the customers that will be impacted, but just in case we didn't have yours:
In order to improve performance, we will be performing some network maintenance in our LA data center on February 8th at 07:00 AM UTC. During this time, your FogBugz On Demand account may be unavailable. We expect our maintenance to be completed within the hour.
I will post a new blog entry as soon as we are done.