We will have a scheduled maintenance window tonight from 8:00pm to 11:00pm PDT. The following changes will take place:

6:00pm PDT (0200 UTC) Weave server upgrade. Code updates to support the 0.7 release. No downtime expected.
7:00pm PDT (0300 UTC) Personas server upgrade. Code updates to enable Firefox 3.6pre builds. Duration 1 hour. Browsers may show a [...]

We will have a scheduled maintenance window tonight from 8:00pm to 11:00pm PDT. The following changes will take place:

7:00pm PDT (0300 UTC) crash-stats.mozilla.com content push. We’ll be picking up code updates (bug 518636). During this time, crash-stats.mozilla.com should be up but some aggregated reports may not be available. crash-reports.mozilla.com will be up and [...]

We will have a scheduled maintenance window tonight from 6:00pm to 11:00pm PDT. The following changes will take place:

6:00pm PDT (0100 UTC) developer.mozilla.org / MDC upgrade. We’ll be updating the software for developer.mozilla.org tonight. See bug 511852 for details. Duration 60 minutes.
6:00pm PDT (0100 UTC) SiteSpect deployment. We’ll be implementing multivariate testing with [...]

We will have a scheduled maintenance window tonight from 8:00pm to 11:00pm PDT. The following changes will take place:

8:00pm PDT (0300 UTC) crash-stats.mozilla.com content push. We’ll be picking up code updates (bug 515739). During this time, crash-stats.mozilla.com should be up but some aggregated reports may not be available. crash-reports.mozilla.com will be up and [...]

We will have a scheduled maintenance window tonight from 8:00pm to 11:00pm PDT. The following changes will take place:

8:00pm PDT (0300 UTC) LDAP infrastructure work. We’ll be refactoring parts of our LDAP infrastructure to improve reliability. During this time, sites that rely on LDAP authentication may be impacted. Duration one hour.

Please let me [...]

We will have a scheduled maintenance window tonight from 6:00pm to 11:00pm PDT. The following changes will take place:

9:00pm PDT (0400 UTC) addons.mozilla.org update. We’ll be updating addons.mozilla.org to pick up code updates (bug 512892). Duration 30 minutes.
9:00pm PDT (0400 UTC) GeoDNS update. We’ll be updating pushing out code updates to our GeoDNS [...]

We will have a scheduled maintenance window tonight from 9:00pm to 11:00pm PDT. The following changes will take place:

7:00pm PDT (0200 UTC) The Amsterdam Reboot. We’ll be turning down services in Amsterdam and pulling production traffic back to San Jose in preparation for The Amsterdam Reboot next week. No user facing downtime is [...]

We will have a scheduled maintenance window tonight from 9:00pm to 11:00pm PDT. The following changes will take place:

9:00pm PDT addons.mozilla.org EV SSL certificate deployment. We’ll be replacing the wild card certificate with a GeoTrust EV SSL certificate tonight. No downtime expected.

Please let me know if you have any reason why we should [...]

(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 10:15pm to 12:15am PDT.
The following work will take place:

10:15pm PDT (0515 UTC) addons.mozilla.org database replication re-sync. We’ll be taking down the [...]

We will have a scheduled maintenance window tonight from 6:00pm to 11:00pm PDT. The following changes will take place:

6:00pm PST (0100 UTC) Kernel upgrades. We’ll be doing kernel security updates on various machines affecting the following services for approximately 10 minutes each:

sand.mozilla.org (part of irc.mozilla.org)
All RHEL-based development machines (hostnames beginning with sm-* or cm-*)
build [...]