It no longer happens
EVERY day... just whenever thay have a patch or an update to push to correct a problem. This usually does work out to "every day" for about a week following each live update. And yes, it normally happens at 10AM Eastern... which translates to 7AM Pacific (location of the server farms is San Diego, Ca.)
But, this morning's downtime was listed as server maintenence and not a patch so it could have been for anything...
Over the Christmas Holidays (starting a few days after LU18), there was a stretch of about ten days running where they never brought the servers down once!
As far as a published schedule, if you check
THIS page, on the right hand side - near the top you will see a box of announcments. It usually lists the next schedueled downtime.
Edited, Sat Jan 7 14:18:30 2006 by OldBlueDragon