If you cannot use Perl expertise for anything else, there's tons of legacy web applications in Perl that still need supporting.
I use Perl frequently when I need a quick one-time access to data - for example extracting data from spreadsheets, databases or web pages.
It's also the language I'm most likely to use when I need to do something more powerful than a straight shell script but less complex than a standalone
Java application - especially if it involves regular expression matching.