I discovered on slideshare the other day a fantastic Moodle presentation written by Alja Suncic.
I have since recreated it in keynote and jazzed it up a tad.
I have written to the author seeking permission to redistribute as I think this is the perfect kind of presentation for expos, conventions, for staff inductions and for all those who ask 'What is Moodle' that arent after the full answer just yet.
I have posted a video of it running below, I will post the link to the keynote itself once permission has been granted to do so.