Except 99.9999% are not worth a ****. Another "tip" she had, never use more than seven slides, or take more than 13 minutes talking about one. Those are limits of average human capability to focus. After that its check your email and play on your phone time. I seriously loathe them. But I see far too many of them, so maybe I'm biased.
You can also add the time and date if you email it to people, but presenting a presentation with that info is superfluous. I start all my meetings with "so, I'm not going to do death by PowerPoint today..."
the worst is people who combine clip-art and power points. Grrrrr.
/end thread hijack