Don't Have a Widescreen Monitor or Projector?
You can still create a widescreen PowerPoint presentation even though you may not have a widescreen monitor or a projector that works in widescreen. PowerPoint will format your presentation for the available space on the screen, just as your regular television will show you a widescreen movie in "letterbox" style, with the black bands on the top and bottom of the screen.
If your presentations will be reused in the years to come, you are wise to start now in creating them in the widescreen format. Keep in mind that converting a presentation to widescreen at a later date, will cause the text and images to be stretched and distorted. You can avoid those pitfalls and have only minimal changes to make at a later date if you start at the beginning in a widescreen format.