I'd say we all use perl for fun :-) That beeing said. I use perl pretty much for anything to keep the swiss army knife sharp and useful.
An incomplete list of my current uses for perl:

• Fun: Acme, Obfuscated Code
• Logfile parsing ( mostly throwaway onliners )
• Shell script replacements
• Unix tools improvements
• Web roboting: WWW::Mechanize + WWW::Mechanize::Shell
• Animating images: Image::Magick Template
• Generating statistics: Statistics::Descriptive
• Show ridiculousness of Java code