I assume you will have a working copy of OA with you, rather than just PPT slides.
Personally think you will struggle to squeeze in everything in 45 mins, (or perhaps I just talk too much when I do training courses
)
Keep it simple, concentrate on all of the stuff we harvest from the machines, if you have a live internet link, and can show some of the "bling" (Warranty links etc) I suspect this is the sort of thing that will get the jaded sysadmins to wake up.
How formal is the talk, is it sit round a table, or large hall full of snoozing faces?
This wouldn't by any chance be an excuse for a few days holiday on the Gold Coast would it?
Cant think why the venue (Cnr Surfers Paradise Bvd and Hanlan St) might make me suspect this...
Any way OA should sell itself, so just enjoy yourself and pass on your enthusiasm.