I've been notified of some datacenter/server maintenance windows coming up shortly:

Germany:
On November 3rd, 2010 at 01:30 to 04:00 CEST (server local time) one of the core datacenter routers will be moved.

Texas:
On November 1st, 2010 at 04:00 CDT (server local time) there will be hardware maintenance occurring.

In both of the above cases the downtime is relatively short. If anyone has any questions please let me know.