We will have a scheduled maintenance window tonight from 6:00pm to 12:00pm PST. This is being tracked in master bug 465599. The following changes will take place:

6:00pm PST (0200 UTC) bugzilla.mozilla.org updates. We’ll be updating bugzilla.mozilla.org to pick up code updates. See bug 464713 for more details. Duration 5 minutes.
7:00pm PST (0300 UTC) [...]

We will have a scheduled maintenance window tonight from 7:00pm to 11:00pm PST. This is being tracked in master bug 464743. The following changes will take place:

7:00pm PST (0300 UTC) support.mozilla.com updates. We’ll be updating support.mozilla.com to pick up code updates. No downtime is expected.
7:00pm PST (0300 UTC) Root-level DNS changes.  We will [...]

(Apologies for the short notice.  We generally want to stick to our normal advertised maintenance windows but sometimes technology works against us.)
We will have an emergency maintenance window tonight from 6pm to 11:00pm PST.
The following work will take place:

6:00pm PST (0200 UTC) ) EqualLogic storage array firmware upgrade.  See bug 464458 for details.  We’ll [...]

We will have a scheduled maintenance window tonight from 7pm to 11:00pm PDT. This is being tracked in master bug 460826. The following changes will take place:

8:00pm PDT (0300 UTC) ) MDC / developer.mozilla.org updates. We’ll be updating developer.mozilla.org to pick up code updates. No downtime is expected.

Please let me know if you [...]

We will have a scheduled maintenance window tonight from 7pm to 11:00pm PDT. This is being tracked in master bug 460825. The following changes will take place:

7:00pm PDT (0200 UTC) support.mozilla.com updates. We’ll be updating support.mozilla.com to pick up code updates. No downtime is expected.
7:00pm PDT (0200 UTC) Mailman / mailing list upgrades. [...]

We will have a scheduled maintenance window tonight from 7pm to 11:00pm PDT. This is being tracked in master bug 459262. The following changes will take place:

7:00pm PDT (0200 UTC) Thirdlane PBX upgrades. We will be upgrading the configuration GUI and its underlying Asterisk add-on features for our phone system. The phone system [...]

We will have a scheduled maintenance window tonight from 7pm to 11:00pm PDT. This is being tracked in master bug 458901. The following changes will take place:

7:00pm PDT (0200 UTC) addons.mozilla.org/*.addons.mozilla.org database restart and code updates. We’ll be updating addons.mozilla.org to pick up code updates. We’ll also be restarting the master database to change [...]

We will have a scheduled maintenance window tonight from 7pm to 11:00pm PDT. This is being tracked in master bug 456442. The following changes will take place:

7:00pm PDT (0200 UTC) support.mozilla.com updates. We’ll be updating support.mozilla.com to pick up code updates. No downtime is expected.
7:00pm PDT (0200 UTC) spreadfirefox.com updates. We’ll be updating spreadfirefox.com [...]

(This work was originally scheduled two weeks ago but postponed a couple times to accommodate build and release related activities.)

A note about an upcoming maintenance window -
We need to take our LDAP infrastructure offline for two hours tomorrow night, which will affect everything that uses LDAP for authentication, including Hg and SVN.
We’ll also use that [...]

(Apologies for the delayed posting… been holding off until I had more authoritative information.)
At around 3:30am PDT, Mozilla’s primary datacenter in San Jose went offline.
From initial conversations with CRG West, we learned they had a catastrophic HVAC failure at 2:46am PDT.  CRG West later reported,
“…service interruption that affected customers at the Market Post Tower data [...]