The following presentation, Introduction to Leadership, is a lecture I give in my course on Business Communication. The slides are not in a style and format I prefer. In non-classroom settings, I try to follow the wisdom from Presentation Zen blogger/author Garr Reynolds. In recognizing my audience (undergrads) desire to copy down bullet points, I've formatted the slides in the manner they are used to receiving.
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Some books on leadership
~ I really enjoyed this book for its insight on human decision making. While its suggestions about nudges are in other context areas, I think they offer valuable advice for the instructional designer.
~ If you are new to Flex/Actionscript 3 this is a really good introduction. There are also lots of gems for the experienced programmer/designer.
~ Whether you are an instructor/trainer/speaker or an instructional designer, this book has a lot of excellence advice not only for presentations, but general user experience and information design.
~ Stephen Few book is a leading expert on visual communication. This book provides great visual examples to reinforce the concepts he lays out. 
~ The title says it all. Web usability is vital for online course delivery. This book offers helpful reminders about your users and how they approach your interface design and functionality. 