You have my sympathy - I know exactly how it feels

You could try borrowing other mongers presentations eg: this old stuff or Google.

You could also try sharing things around by asking all attendees to:

• talk (even from their seat) for 5 minutes about their favourite CPAN module.
• talk about their favourite perl command line switch (or a useful one-liner)
• describe the last bug in their code that kept them guessing

To encourage early takers, make a rule that no one can talk on the same subject as an earlier speaker