I've stumbled across a lot of stories lately about giving better presentations. As you know, selling your idea to a potential client or your internal powers-that-be is often just as important as the idea itself. Being able to communicate effectively increases the chances your idea will gain traction and be given the attention it deserves.
The format for many of these presentations is the dreaded Powerpoint. Speaking in public is hard enough. Creating an engaging visual presentation to accompany your talk makes it even more difficult.
Fortunately there are many good resources to help you give a better presentation.
As for the things to avoid, comedian Don McMillan pretty much nails it.