Every Slide tells a story
Seth's Blog is marvellously pithy today the link will take you there, but here's what he says:
Every graph and table, too.
Your Power point is not a presentation of data. It is a story, a story designed to change minds.
If you want to present data, use a list. If you have a list, put it in a printed appendix.
If I can't figure out what your point is, you've merely given me data. Send that in a memo instead, please.