Strangely, there's a new firmware update available on the PS3. However, it doesn't appear as though you're required to download it. You'll have to choose to manually update your system by accessing Network Update from the XMB. Considering the rather minute jump in the firmware version number (2.42 -> 2.43), we're assuming this update doesn't do much. Stay tuned.Update:
The firmware update will improve Japan's PS Store and video rental service. No need for non-Japanese PS3 owners to update.