The Playstation network has been down since about 20th April now. The full consequences of the attack may take some time to manifest, however the commitment to ensuring security since the attack has been foremost in Sony's agenda. The difficulty here is that although what has happened may be relatively clear, the how and who may be less obvious and because of this Sony need to take extra care when restoring the services as they cannot afford another similar incident. The fact that they may be offering a reward for information relating to the identity of the attackers proves that whoever did this were skilled enough to hide their tracks well. With enough digging, many clever breaches can be traced due to the smallest fragment of information in the logs or other data leading to clues. There is claim that information pertaining to the group Anonymous has been located on the systems, however Anonymous have denied the incident and apparently say they may have been framed. If the o...