Sony's revealed that the PlayStation Network is offline for scheduled maintenance from 06:00 to 09:00 GMT on Monday 12 November 2012.
During the maintenance, you will be unable to access the following services:
PlayStation Store on PS3 and PSP.
PlayStation Network Account Management.
PlayStation Network Account Registration.
In addition, you will not be able to sign in to PlayStation Network from eu.playstation.com.
You can continue to collect in-game trophies during this time obviously and these will be updated on your profile once PlayStation Network is back up and running.