C0deZer0Oc'D To Rhythm And PolicePremium
I'd hate to say it, but not much... And chances are it's rather old if it came with only a 20gb hard drive.
It'd only be of value to someone if it was still running an old enough dashboard to be able to JTAG it, but they'd also have to be savvy enough to do such a thing. Not many people are, and if you've updated it or played anything recent on it, chances are it isn't.
Because, f*ck Sony