Sony has released a mandatory software update (3.42) that patches the recent jailbreak of the system.
This posted was posted on the official PS3 blog by John Koller, Sony's director of Hardware Marketing:
Hi everyone! A minor update to your PS3 system is now available via system software update v3.42 that includes additional security features. For more details and instructions on how to update the system software for the PS3 system, please visit the PS3 System Updates page.
Early reports state that this patches the PS3Jailbreak and related open source derivatives. After all, once the jailbreak went open source, Sony's weapon of choice against hackers - lawsuits - are of limited use.
The choice is simple - jailbreak and be able to run all sorts of unsigned code, or continued access to PlayStation Network/PlayStation Store. Either/Or, not both ...