A common cliche about PowerPoint is that all presenters do is read a list of bullet points off of each slide. Fortunately, it is possible to avoid this cliche by reorganizing slides to minimize bullet points. You might even think of ways of using PowerPoint slides to generate student interaction.
Some common tips (in a bullet list).
Another tip is to consider separating your speaking notes from the actual slides. That's one reason PowerPoint provides a Notes area which can be printed beneath a slide (in the instructor copy).