I know it sounds a little corny but these days I would want to take a searchable mirror of perlmonks with me. I'm regularly searching it for usefull code examples and usualy someone has asked a quetion in the past that has produced a solution to any current quandary I may have.

In addition I think I would want copies of the online manuals for Apache and MySQL.

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Remember that amateurs built Noah's Ark. Professionals built the Titanic.