While running the fix_permissions script version 2.05 from the wiki page (in turn taken from the XDA Developers thread) on my PRS-T1 I noticed some error on a Sony's package whose name had a space in its data path. I fixed a couple more minor things that seemed wrong into the script.
Not being sure if there's an "official" page or so I committed the changed script on github, here's the link:
https://github.com/anddam/PRS-T1-fix_permissions
Just FYI.