Two CC's 
Additional AC Blogs
Presentation Zen – Garr Reynolds blog on issues related to professional design
Presentation Revolution. This is the blog of Ethos3, a presentation training and slide design company.
Six Minutes. Andrew Dlugan loves analysis and categorization- and his audience benefits. Andrew Dlugen gives us “Public Speaking Articles: Week in Review” every Saturday highlighting the top speaking posts during the week.
Speak Schmeak. Lisa Braithwaite updates her blog almost daily and gives useful insights into presenting.
Memo to C-level Speakers. Pete Ryckman has a speech writing background and it shows.
Great Public Speaking – Tom Antion’s prolific blog on stage tips, speech preparation tips, speaker marketing tips, and much, much more.
High Stakes Presentations – helping High Stakes Presenters acquire the knowledge and skill they need to become accomplished speakers.
The Extreme Presentation Method. Andrew Abela is a presentation trainer with a particular interest in visual thinking – how to effectively portray concepts in a visual way.
Dave Paradi’s PowerPoint Blog. Dave Paradi takes the principles of effective use of PowerPoint and shows you how to do it in practice. His weekly slide makeover podcasts are excellent.