A more concise, but less fun, question would be, "What don't you use Perl for?" The lists would be much shorter. :)

• Blog platform (in Catalyst).
• Parsing data from diving websites and writing into Excel sheets.
• Server health checkups.
• Converting broken, nasty Project Gutenberg HTML to clean XHTML and automatically posting it.
• Ajax forms and user voting.
• Jokes, like Acme::LOLCAT.
• RSS/Atom writing and reading.
• Automatic tear down and rebuilding of databases; DBIx::Class::Schema::Loader + DBICx::Deploy.
• Reminder emails.
• Date counters and parsers.
• Graphing weblog stats.
• Filtering mixed text+html perfectly to clean XHTML with DWIM paragraphs and newlines.
• Perl code coloring.
• Chat server.
• Typographical auto-markup; e.g., (r) --> ®.
• RTF --> HTML.
• CSS collapsing and style inlining.
• Perl controlled rsync as part of build scripts.
• Colored XHTML document revision diffs.
• Tax calculators.
• Order tracking and manipulation.
• Language translation services.
• Search engines; raw, metaphone, vector.
• DB --> YAML --> DB.
• MP3 manipulation.
• Image stamping.
• Et cetera, et cetera

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