Update: Sony has pulled the firmware update for now.
Sony has pushed out a new PS3 firmware update. System software 4.45 was supposed to add trophy notification options and improve overall system stability.
Unfortunately, it did quite the opposite.
The PlayStation community forums have blown up with reports of the firmware causing several issues, including causing consoles to become completely unresponsive.
Sony has yet to respond to these issues that have cropped up. In the meantime, PS3 owners are advised not to update to 4.45 at this time (although it may already be too late for some members of the Shacknews community).