We are still investigating the DB issue that was causing problems. Normally we would be in the process of switching over to a back up. However our 2nd backup (so we have a backup when we come back up) is more than a few hours behind. We need to keep the grid offline while this backup catches up.
We estimate that Second Life should be back open approximately 7:30pm PST (3 hours from this post).
Sorry for the inconvenience.