So the PS3 HD is a no go for sure? I always thought that the whole point of encryption was to prevent HD access from outside the PS£ (I.e. network or Linux). If you are running an alternate file browser from within the PS3 OS is it not possible that the HD will be unlocked or at least semi-accessible?
I suppose the only way to find out would be to code a file browser (I wish I had the knowledge), for someone who knows it must be pretty basic stuff. I've seen similar projects on mobile phones that include file management and FTP such as mobyexplorer.