In early October I had the pleasure of being a last-minute addition to the Puppet Camp lineup, speaking about security and extensibility in Puppet.  It was a blast.

Slides: http://rcrowley.org/talks/puppet-camp-2010.

Video, courtesy of Puppet Labs:

Toward the end I pause and look at the back for a while, seemingly without reason.  Luke was outside in the lobby having a conversation while standing in the perfect location for his voice to echo all the way to the front and I thought he was asking a question.  False alarm.