This webpage gathers some interesting resources on effective presentations.
Probably the most inspiring person in this domain, Jean-Luc Doumont delivers many workshops on the topic. Check out his websites for more info: http://principiae.be/ (company website) and about communications on nature.com. Jean-Luc also describes in details how to do nice graphs here.
David Allen is famously known for his book Getting Things Done, which lead to the GTD movement. Among other things, he reminds us in this video how the brain is wired to do brainstorming. I also develop on this topic here.
Here are also two videos I find amazing to prepare on the presentation day: