Here are some related websites that contain useful related information.
Indezine
This site, hosted by Geetesh Bajaj, offers a wide variety of visual design suggestions, including PowerPoint tutorials, tips, articles, reviews, etc.
Communitelligence
John Gerstner hosts the interwoven communication skills site that incorporates content across a wide spectrum of topics, with contributions from numerous experts. Learn about leadership, marketing, PR, social media strategies, and more.
Distinction
This highly creative group, pioneered by Jim Endicott, offer visual design services, training, skills workshops, as well as tips and techniques for more effective presentations.