A new mandatory firmware is now available for download for PS3 users who are using the PlayStation Network service.
The 3.66 version firmware that Sony released today does not offer any new things at all. According to Eric Lempel of SCEA, the new update will only stabilize its network, and the stability of the PS3 games.
The 3.66 firmware can be downloaded via the System Update or simply go to the official PlayStation website.