If you want to buy one book to improve your presentations I highly recommend HBR Guide to Persuasive Presentations (Harvard Business Review Guides). Nancy Duarte does an outstanding job condensing and organizing information that is impactful. My copy is getting a little dog eared. Even as an experienced presenter I find myself referencing it and The Naked Presenter.
Here are the additional resources referenced in the Tech Communication Made Easy class.
Simon Sinek and his TED Talk Start with Why
Book: Start with Why: How Great Leaders Inspire Everyone to Take Action
More about leadership than presenting directly, but if you can inspire people to take action in an organization you can do the same in a presentation.
SkillShare Class: How to Present: Share Ideas That Inspire Action See my notes from the class here.
Book: The Naked Presenter: Delivering Powerful Presentations With or Without Slides (Voices That Matter)
Post: The key to storytelling is in the giving, not the getting
Post: 10 Tips to improve your presentations and speeches
Post: Communication lessons from Frank Sinatra
Book: Resonate: Present Visual Stories that Transform Audiences also available Free Online Version
Book: slide:ology: The Art and Science of Creating Great Presentations
Book: HBR Guide to Persuasive Presentations (Harvard Business Review Guides)
Post: Re-Designing Mary Meeker’s Trends Report
Post: Make Stories More Moving with Myth
Post: Great Presenters are Everywhere
Zach Holman and his site dedicated to public speaking and presenting skills
Post: Repetition
Post: Typography
Post: Outlining
Specialized:
Designing Science Presentations: A Visual Guide to Figures, Papers, Slides, Posters, and More