AFAIK not much at the moment.
In the short term I’d expect Other OS or some other Linux-based OS to be released sometime in the coming months along with firmware and security patches to prevent Sony from remotely detecting and removing it. Sony themselves may re-release it to keep people from “jailbreaking” their PS3’s. Expect to see piracy skyrocket and all remaining anti-piracy measures, both online and offline, circumvented within the next year. As Nintendo learned, once users can run custom-code the battle is over.
I’m surprised they didn’t fully implement their own security policy. The hardware is set up to allow much stronger security than what they actually used.