IBM publishes some fine free resources. I hope they keep doing it.

Some of the little things we should watch out for are correctness and completeness, especially from someone who has written Debugging Perl.

Factual errors and omissions are embarassing. I'm sure he didn't make them on purpose, which makes downvoting and including constructive comments all the more important. Nobody learns from mistakes they aren't aware they've made.

-- Rocco Caputo - http://poe.perl.org/