You've heard me say it before--PowerPoint Bullets Are Evil. You've heard Chris Brogan say "Don't. Read. Your. Dumb. Slides." and then again. You've read about why it's so important to avoid using bullet points with PowerPoint and to let your speech stand on its own or at least use powerful images to back it up when necessary.
If you're still wondering why, look at this. Seriously, look. It will make hardened presenters roll on the floor with laughter and jaded audience members nod their heads off in agreement.