PowerPoint has been coming up a lot lately in the context of a presentation instead of a plan. In my opinion a good presentation is an excellent tool for communicating, and bad PowerPoint is an excellent tool for boring people to death. The slides are the medium, not the content.
A plan could be communicated with slides, just as it could also be communicated with printed paper, or for that matter just talk. The point is planning and the form depends on the context.
Which brings me to this three-minute video on How Not to Use PowerPoint, by Don McMillan.