I own all the O'Reilly Perl books, and this definitely filled the gap between the Llama and the Camel. If you are new to programming, and sometimes get stumped reading the Camel or Panther, take some time out and read this book. It covers some ground that we sometimes miss when we get thrown into projects in todays hectic workplace. It is also written and I find it very enjoyable to read. I give it a "2 Two Thumbs Up".