An old article, but one that is (sadly) still relevant today:
http://www.nytimes.com/2010/04/27/world/27powerpoint.html?_r=0
I like Powerpoint for a lot of things, but the phrase "Make a powerpoint brief and bring it to me" is used way too often. If all you need to answer a problem is a powerpoint brief, than maybe the problem is too easy, and you could have just posted the brief on a website to be reviewed without making everyone sit in a room with you.
