Slides:

• Start with your main point, then add details, repeating the main point after each detail. (So your audience can space out, or come in late, and still follow your talk. And you won't panic if you run out of time.)
• Plan to talk for one or two minutes during each slide.
• Write a clear title on every slide, in a large sans-serif font.
• Use simple pictures instead of text.
• Avoid bullet lists, logos, dates, background images, repeated references to your name, your organization, the conference name, etc.

Speaking:

• Look at your audience or your screen - not your laptop.
• Emphasize your main point: Say "This is my main point", or change your voice, speaking very slowly, or leave a long pause after your main point.
• Feel free to pause to collect your thoughts. Don't rush. The audience is reading your slide. Don't say Ummmmm!

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