As of this evening the PlayStation network has started to work again.
It seemed to close down on the 20th of April so that is what you call a serious problem they had there!
When you go to restart using it you will need to download a software update, and it will then make you change your password.. for obvious reasons if you have been following all the stories in the media.
Tis good to have it back.. a shame Sony took it down for so long and made so little contact with PlayStation owners though - their status has taken a massive knock in my view.
I just played 2 games of Warhawk... neat to be back...