Depends on your experience. If you're a non-programmer who wants to learn Perl as your first programming language, then you'd be better off with Elements of Programming with Perl or Beginning Perl. If you're a programmer who just wants to learn a new language then either the Llama or the Camel might be for you. The Llama (Learning Perl) is a tutorial and the Camel (Programming Perl) is a reference. Some people can learn from references, some need a tutorial.

If you feel the Llama is over your head, then the Camel will be waaay over your head and you'd be better off looking at one of the two books I listed above.

Perl Training in the UK <http://www.iterative-software.com>