For years I have been interested in how people present (both face-to-face and online) and how they use technology to deliver effective presentations.  For instance, the following are a few things I have done over the years on this topic:

• Giving Effective Presentations:
  http://www.slideshare.net/plowenthal/giving-effective-presentations
  (email me for the most recent version of this presentation)

• Using PowerPoint differently online:
  http://www.slideshare.net/plowenthal/usingpowerpointdifferently-springguestpresentation-2010-100204153759-phpapp02

• Improving the Design of PowerPoint Presentations:
  http://www.ucdenver.edu/academics/CUOnline/FacultyResources/additionalResources/Handbook/Documents/Chapter_12.pdf 

• A Review of Tufte’s “Cogntive Style of PowerPoint”:
  http://edrev.asu.edu/brief/jan08.html#7 

But one of the places I look to each year for some inspiration is SlideShare’s “World’s Best Presentation Contest”.

Here are the results from 2010:
http://www.slideshare.net/contest/worlds-best-presentation-contest-2010