People have been going pretty crazy over the last 24 hours, as the PlayStation Network pretty much collapsed. Anyone with a pre-PS3 slim console was advised to literally not use their PlayStation 3 as Sony weren't sure of the damage that could be caused. However, it now appears to be resolved.
Many users have reported that their PS3s are now connected to the PlayStation Network, and they are now able to play games like Heavy Rain or Dynasty Warriors Strikeforce.
We've personally tested our PS3 and it works absolutely fine now. There has currently been no official word from Sony about a fix though, so those who're still worried might want to hold off for a bit.