2005 :

Apress :
Pro Perl Parsing

oreilly :
Advanced Perl Programming, 2nd Edition
Learning Perl 4Ed
Perl Best Practices
Perl Testing A Developer's Notebook

SAms :
Teach Yourself Perl in 24 Hours

2006 :

Apress :
Beginning Perl Web Development From Novice to Professional

No Starch Press :
Wicked Cool Perl Scripts, Useful Perl Scripts That Solve Difficult Problems

oreilly :
Intermediate Perl
Perl Hacks

Visibooks :
The Visibooks Guide to PERL Basics

Before :

Manning :
Extending And Embedding Perl 2003
Graphics Programming With Perl 2002
Object Oriented Perl 2000
Web Development with Apache and Perl

McGrawHil :
Perl The Complete Reference 2nd Ed 2001

oreilly :
Cgi Programming With Perl, 2Nd Edition 2000
Learning Perl Objects, References and Modules 2003
Mastering Algorithms With Perl 1999
Mastering Perl for Bioinformatics 2003
Perl & XML 2002
Perl 6 and Parrot Essentials, 2nd Edition 2004
Perl 6 Essentials 2003
Perl Cookbook, 2nd Edition 2003
Perl for Oracle DBAs 2002
Perl in a nutshell second edition 2002
Perl Template Toolkit 2003
Programming Perl, 3Rd Edition 2000
Programming Web Services with Perl 2002
Writing Apache Modules With Perl And C 1999

various :
Teach Yourself Perl In 21 Days
wrox, Professional Perl Programming 2001