Google knows all. I googled "pua storytelling" and was immediately hit by a page of decent material, including 4 or 5 posts from this forum.
If you want some practical advice, try Youtube-ing interviews from talk shows. You'll quickly identify great storytellers. One great storyteller, in particular, is Gary Busey. I remember watching him on Letterman talking about his farm, and he had the entire audience, including Letterman, engrossed.
http://www.youtube.com/watch?v=cqdyQBXcqkQ
Other than that, just try to include as many DHVs as you can. Also, try to make the stories interactive so the set or target doesn't get bored.
Hope this helps!