Aimee "Ashlanne" Rekoske posted on the Station Community Forums:
From 6:00 AM PST until 8:00 AM PST on Tuesday, November 17, 2009, SOE Account and Commerce flow, Station Store and the Station Marketplace will be unavailable. We expect this maintenance to take approximately 2 hours.
This downtime may also cause some forum accounts to temporarily lose permissions, due to the inability to verify account status while the maintenance is taking place. This is only temporary and normal permissions will return automatically once the maintenance is complete.
Here's a handy time zone converter to help you plan!