I love this - I got this in a professional newsletter (marketingprofs.com) today:
Recently, PowerPoint quietly celebrated its 20th birthday. Lee Gomes wrote in The Wall Street Journal about the most influential and most groaned-about pieces of software: "There won't be a lot of birthday celebrations for PowerPoint; the program is one the world loves to mock almost as much as it loves to use. While PowerPoint has served as the metronome for countless crisp presentations, it has also allowed an endless expanse of dimwit ideas to be dressed up with graphical respectability."
See this - this is great: http://norvig.com/Gettysburg/