I just finished the book Presentation Zen by Garr Reynolds which carries the subtitle: Simple Ideas on Presentation Design and Delivery. If I had to sum it up in three words, 'Less is more.'
Not that it's surprising, but still a worthwhile reminder. Especially for anyone who has been stuck in front of The Powerpoint Presentation from H---
I think a great video that showcases how much design influences content, in done in an easily accessible way is this Youtube video which was actually created by some members of Microsoft.
"Microsoft Re-Designs the Ipod Packaging