Best Perl Book for Beginners ... Learning Perl,
Hmm... depends on what you're calling "beginner" I guess :-) For people who already know another language I'd recommend the Camel over Learning Perl - which seems aimed more at people new to programming
Personally, when teaching newbies, I don't find Learning Perl that useful. Don't get me wrong it's a nice book, but I don't find that the order and emphasis of topics match the way I teach (e.g. I introduce OO and references quite early.)
Unfortunately I've not come across anything else I like either - so maybe it does still count as best...
Best Perl Book for General Reading ... Perl Best Practices
I'd probably nominate Peter Scott's excellent Perl Medic. A darn fine combination of decent prose and good advice. I'll save PBP for later...
The Perl Book I Want Everyone to Read ... Perl Testing: a Developer's Notebook
This is the category I'd vote Perl Best Practices in under. It would make my life a lot easier if everybody followed the practices in this book. Even the ones I disagree with!
Now - you know I'm a testing junkie and, like you, testing has radically improved the quality of the software I help develop. However while PTDN is a nice introduction to testing with Perl, and I bought copies for work, I don't think that its the sort of book to turn people on to testing who aren't already test infected. It demonstrates how to test - but not why testing can be so good.
So PTDN would fall into the category of "Perl book I would want people to want to read" :-)
Most Fun Perl Book
Higher Order Perl.
(It is entirely possible that I have a different definition of fun from other people.)
Although one of the main effects of my reading it was making me go reinstall Lisp on my powerbook - which may have not been its authors intent :-)
Best Perl Book of All Time
For me it'll be the Camel book. Bought three editions so far. I originally learned Perl 4 from the old pink edition, and all the others have been useful in getting an overview of everything in the language.