If your presentations suck, your audience is likely daydreaming.   Stop hitting people over the head with "facts" and start telling a compelling story - here is Cliff Atkinson's take. 

Combine this with Jungian archetypes (a la the "brand" gurus) and Cialdani's research collections around influence, and finally "Get Your Point Across in the 30 Seconds or Less" and see if your success doesn't rise dramatically....

Here is a Cliff Atkinson overview I found (wish I could find the one I saw years ago):