Well, I did see this on the norwegian psn-forum today about WipEout HD:
-----------------------
Vedlikehold:

Dato: 08/10/2009

Starttid: 10:30
Endtid: 12:30
------------------------------------

Translation :

Maintenance:
Date: October 8, 2009 (Thursday)
Start time : 10:30 (Norwegian time is GMT+1)
End time : 12:30
Fingers crossed that this has to do with the leaderboards. I can't really think of anything else that needs maintenance right now.