Here's a great movie that is streamed from Apple's website on presentation skills

if you're a veteran or novice presenter, using any application, this is worth watching

total time 33 minutes

http://www.macintechsig.org/files/PresentationSkills_sref_300.mov

to watch the streaming movie online, click the link

to download the item, click the link, then after the movie loads, click in the bottom right corner of the control bar and choose Save as Quicktime file to disk