On a Unix, one can do man -Tps perlref > perlref.ps and get documentation in postscript format. Then one can scale that down in order to save some trees (using pstops for instance) and print it on both sides (to save more trees). Then one can bind it and read it instead of novels when going to work or back.

That's what I did. My journeys to/from work will no longer be the same.