Anonymous claims that they didn't do it this time. here: http://ps3.dashhacks.com/2011/04/21/worldwide-psn-outage
Me? The only thing I've ever managed to do is empty the recycle bin in the computer. Yup, Anonymous can only go as far as what they did. But the hackers aren't individuals, and didn't do it for gags. Sony should have seen it coming. But don't be so sure that they have nothing to do with this either.
Custom Firmware and thanks! hell yea not a chance why would this guy jump from this website then go to sony why not go straight for sony