I use some basic perl in managing some servers. I have most of the perl books in my collection. Of late there are hardly any good books and most of the new ones is "old wine in new bottle". I plan to use PHP for web based applications. It really easier to learn. Also looking at Python(clean syntax!)
To me Perl has evolved into a complicated programming language. I believe it is good most of the time for Sysadmin purposes. There are other languages which are better suited for other purposes. No need to use perl for everything !!
Wish there was a "head first" series on Perl/PHP/Python