Catcher in the Rye
-- I've been asked about this one. This book is all about perceptions: our perceptions of others, and our concerns about the perception other people have of ourself. Realizing your own hangups, and when you/others are being "phoney" can vastly reduce the amount of bullshit you waste time on in your life/work.
Re: Which non-Perl books made you a better (?:Perl )?Programmer?