Another happy hacker here - on Windows XP. I just upgraded my PRS-650 with the 1.05f Boroda firmware. Worked like a dream. Thank you Boroda/Porkupan
I'm used to having the PRS+ hack on my PRS-505 so it's great to have the epub/userStyle.css facility on the new reader.
P.S I was wondering, is it technically possible to add in-book access to TOC as a keyboard shortcut? For some reason Sony have buried it 3-levels down (Options - Goto - TOC)