From http://status.secondlifegrid.net/

Scheduled Maintenance May 8, 9, 10

Posted by Status Desk on May 8th, 2012 at 09:51 am PDT

[Posted 9:45am PDT, 8 May 2012] We will be performing scheduled maintenance today, Wednesday and Thursday of this week (May 8, May 9, May 10), beginning at 6:00pm PDT each day. Each maintenance is scheduled to last around 8 hours. Please save all builds and refrain from rezzing no copy objects, as some regions may be taken offline and remain offline for extended periods of time. Please follow this blog for any updated information.
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These maintenances will be during meeroo primetime (with the 8/9pm change over for breeding cycles). I have informed Masquerade Ball about it so the Malevey team can be "on it" because there is no way to tell how much this is going to affect our breeding. LL tends to do a lot of rollbacks when they do these sorts of maintenances so it is entirely probable that nests will be lost. You will want to keep an eye on your herd.