Perl Debugger Pocket Reference edited by Linda Mui and published by
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.
The CDC Technical Specification document - describing how Ronan Ogerand 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.
Slightly off-topic, but most entertaining is my translation into English of Einz, Zwei, Frei! Enjoy :-)