You can never have too many Camels or Rams. Buy a Learning Perl for a loved one and not only do you make your shopping list a bit shorter, but Randal gets 3 cents.
After thinking about it a bit, I realized that the Amazon.com Web Services license lets me show their data if I link back to the product. I programatically searched for the keyword "Perl" and pulled out the top ranked Perl books.
These results are different than the results I got yesterday. I think there is some voodoo in the sales ranking. I do not see how the Perl Cookbook should rank so poorly, especially against Perl for Oracle DBAs.