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I've written a couple of things which may be of interest, mostly relating to the Perl programming language:

Pro Perl Debugging co-authored with Andy Lester, edited by Jason Gilmore and published by Apress.

RT Essentials with co-authors: Jesse Vincent, Robert Spier, Dave Rolsky, Autarch and edited by Allison Randall and published by O'Reilly.

The Perl Debugger Pocket Reference edited by Linda Mui and published by O'Reillys.
This also has a nice little printable bookmark card to go with it, which you can print out and use, or write to O'Reilly for a free one.

Also: The perldebtut.pod a debugger tutorial distributed with the Perl source. And an article in the Perl Review. http://www.theperlreview.com/SamplePages/ThePerlReview-v3i3.p10.pdf">Perl Review

The CDC Technical Specification document - describing how Ronan Oger and I designed and implemented a safe one-time-key encryption application to pump large (5 million line) financial trading feeds, through a daily process with a small time window, for UBS Investment Bank in Zurich, Switzerland. Not available - though expect an article on it sometime.