A very nice Presentation by Garr Reynolds on how to improve your presentations by understanding how our brain works. It's actually nothing spectacular, but still always worth remembering:
Here are my three Key Take-Aways:
1. Create a storyline around the "Big Picture" first, then add details.
2. Think visually, use pictures
3. We don't pay attention to boring things, so do something interesting every 10 minutes (that's when the human attention span usually drops down)