If you write CGI scripts in perl and are not taking advantage of cgi.pm, then you're doing things the hard way. Written to take the tedium out of scripting, the module allows you to use easy to remember shortcuts to code some of the more difficult things in perl. Cookie setting and retrival is a snap, as is allowing users to upload files, and more. For advanced programmers, the object oriented method is supported and also very easy to use.
The book is easy to follow and contains some illustrative examples that are also available on a companion website. My one and only complaint is the price of the book: it seems a little steep given that most of the material in there is available on the web in one form or another for free. If you don't want to take the time printing and compiling, then this is an excellent manual that will soon sport bookmarks and highlights throughout.