Reading your slides - Don't even summarize them. The slides should reinforce or support whatever subtopic you want to address. A pie chart should be on the screen so you can point to the most interesting or troubling bits and comment.

Lots and lots of bullet points - no more than three or four per slide, with minimal text for each. Do not feel compelled to use complete sentences.

Putting the organization's logo on every page - Use it once on the title page and once on the final slide.

Lots of different fonts - Stick with one or two styles and one or two colors. Always pick fonts and colors for easy readability not for looks.

Fancy transitions - Just because PowerPoint has a bunch of transition options, that doesn't mean you need to have four or five in a deck of 15 slides. Stick with the one, simple transition for about 99% of all presentations.

Too much information - a short quote, a simple chart, or a few statistics should be about all

Fancy slides - No one wants to read yellow text on an fancy black, silver, and electric blue slide.