by TomChristiansen and NathanTorkington. A collection of answers to "how do I ...?" questions of varying complexity. Possibly the most useful Perl book around and deserving of inclusion in any list of DefinitivePerlBooks.
First edition: ISBN: 1565922433 http://books.perl.org/book/131 
Second edition: ISBN: 0596003137 (Aug 2003) http://books.perl.org/book/203 
One of the CookbookSeries published by OreillyAndAssociates.