Larry Wall

Technical manual. The 'camel book' has much useful info about perl, and not just dry technical stuff.

This book has more information in the first few chapters than most entire perl books. I am a big fan of the "logically break things down to every last detail" genre of programming manuals (see The C Programming Language, Programming in Lua) and this book is one of the great examples of it.

Excellent reference work. It was better, back in the first edition, when the programming examples were co-bound, but it's really getting so huge (all the useful libraries) I can see why they don't do that any more.

TMTOWDI!

A classic, but way too dense. It fits it's purpose of presenting a general view of the language, but i haven't learned Perl from it. Well, i don't work with Perl at all, but knowing that it is such a powerful language i might take another peek at it in the near future. Or when Perl 6 is released.