Just in case you weren’t looking around on the net, you possibly missed Sony’s announcement that the Playstation 3 and PSP network would “undergo maintenance” from about 7 AM PST to about 3:30 PM PST. During this short period players won’t be able to get into the Playstation Store, Playstation Home, or Account Management. Some may have trouble signing in.
So don’t panic, this is supposed to happen. Relax, kick back, and enjoy some couch co-op for a bit.