To have a slightly adjusted echo from our news post from yesterday:
Our San Francisco data center is taking a little downtime for power maintenance, which means so are we. You won't be able to access the site on October 29 from 8:30PM to 12:30AM (October 30) PST. We apologize for the interruption in service and we'll work hard to make sure we're back up and running as soon as possible!
Eh, one final edit: The maintenance window will be Thursday, October 30, 2008 at 03:30:00 UTC to Thursday, October 30, 2008 at 07:30:00 UTC. In the future I'll probably keep the time in UTC; I did it in the Pacific time zone since that's where our admin team is located.
I've found www.timeanddate.com to be a handy timezone converter if anyone wants to find out what time our maintenance window will be in their local time.