Some links that might inspire you:-
Garr Reynolds has some great advice and resources around presentation and branding.
There is nothing Edward Tufte doesn’t know about visual representation of information and data. His site is a fascinating amalgam of erudite learning on art, typography and information technology. You might start with his startling analysis of how bad PowerPoint slides contributed to the Columbia Shuttle Disaster!
The Thiagi Group generously provide a wealth of fun and effective resources for training and facililtating on their website.
Michael Alley of Penn State University suggests a far better way of using PowerPoint for presenting scientific data, called The Assertion-Evidence Structure. I think it could have much wider application. Read about it here.
(more links coming – visit often!)