The Obama poster by Shepard Fairey is the icon of 2008.
Here is a tool to make your own. You see, there is still some work to do before I can make it as a presidential candidate.
Jokes aside. Icons can be powerful visual tools to use in presentations. Famous historical moments, famous historical pictures, famous historical posters. 
An earlier post about real historical images from LIFE magazine available on Google.

If you liked this post, why not subscribe to daily updates about presentation design via email? Just blog posts, no spam, or you can follow Jan on Twitter to never miss a thing.