I know this is a long shot, especially since a search of these forums didn't turn anything up for me. But is there any custom firmware hack or 3rd party tool that allows you to search for a word or phrase on the PRS-505?
I know Sony didn't include it, and their reasoning is probably related to the lack of keyboard or touchscreen. But there's no reason we couldn't use the the d-pad to move around a virtual keyboard or use the number buttons T9 style like the jetBook. I was about to buy one, but now I'm having trouble convincing myself this isn't a deal breaker.