Sony are a flippin HUGE company! - whilst not on the scale of Google they are definately a large company which SHOULD have the resources to deal with a problem of this large a scale.
I bet DDOS attacks ended yesterday and this is just now a failing of the crappy infrastructure having to take the extra load of the new xmas players.
If it was DDOS attackers - im pretty sure they would have been quick to place the blame elsewhere instead of not releasing anything to the public like they are doing now.
Either way - its appalling that they are no able to cope in this day and age of the interwebz. Heads should roll.
Maybe have a read up on DDoS and why its next to impossible to prevent so you don't look completely clueless.
It takes advantage of a core weakness that is needed for the entire internet to work, the only way to stop it is to redesign the internet which was created in the 70's and then persuade everybody in the world to change their equipment to be compatible with the new internet you have designed.
Crack on, and good luck.
The reason Google is not effected as much is because people only connect for a very short time, people get their search and they are off the server within seconds or milliseconds.
The likes of Live or PSN need a CONSTANT connection over possibly hours to their clients which is why these DDoS scriptkiddies like to attack them because its much easier to see an effect from their work so they can forget that they are spotty virgins with half a neck beard in their moms basement for a bit.
They picked Christmas because they knew the networks would already be busy so it would require less effort to clog the servers up, and they knew their would be lots of clueless whiners who have no idea what they are talking about quick to blame everyone else other than the sad little gits who are doing this.
The Botnets these guys are renting very cheaply are the legacy of years of MS OS's that were embarrassingly insecure and have unsuspecting owners getting used as zombies PC's. It must wind the MS management up that its their crap OS's bringing their own servers down.
I don't understand how these people never get caught, hopefully they will this time as I can't see many judges taking kindly to people who target kids at Christmas.
They rent the Botnets off a third party (The actual hackers who have literally 100's of thousands of slave PC's all over the world.) and then tell that third party just target it at the PSN IP.
They then post on Twitter about how awesome they are whilst hoping their mum doesn't catch them.
People who have no idea what they are talking about them pass comment on it in the news and on forums.