You mention this is about a half hour presentation. Based on the range of ideas you present, that probably means you intend to narrow it down to one or two bullet points to stay within the time allotment.
Not knowing the background of the audience, here is a perspective from a 'bean-counter' type manager who cares most about Business Advantages: 1) what advantages in terms of total cost of ownership; 2) what benefits and momentum would encourage a switch to Parrot instead of (say for example) dotNet (or are the two mutually compatible); 3) what advantages do you see in terms of product lifecycle, production process and acquiring and maintaining personnel who are competent with this technology.
As with any presentation, the know your audience rule surely must apply here ... so the preceeding is just one perspective assuming you are talking to a not-necessarily-perl-centric crowd that may not be intimately familiar with the technical details, but still interested if you can present a compelling strategic, business value proposition.