Sony started sending out the following emails:
Notice: Unauthorized circumvention devices for the PlayStation(R)3 system have been recently released by hackers for the PlayStation(R)3 system. These devices permit the use of unauthorized or pirated software.
Use of such devices or software violates the terms of your “System Software License Agreement for the PlayStation(R)3 System” and the “Terms of Services
and User Agreement” for the PlayStation(R)Network/Qriocity(TM) and its Community Code of Conduct provisions.
In addition, copying or playing pirated software is a violation of International Copyright Laws.
A circumvention device and/or unauthorized or pirated software currently resides on your PlayStation(R)3 system. Immediately cease use and remove all circumvention devices and delete all unauthorized or pirated software from your PlayStation(R)3 system. Failure to do so will result in termination of your access to the PlayStation(R)Network and access to Qriocity(TM) services through your PlayStation(R)3 system.
Somehow they are able to detect if you have jailbroken your PS3. Might be a good idea to keep your Playstation unplugged from the network until a workaround can be found.