by Beyond Lab
Last month's Nature Methods had an editorial named "talking points".
The short list of advice is:
1. Plan for the allotted time.
2. Know your audience.
3. Define your goals.
4. Structure your talk.
5. Keep your slides simple (content).
6. Keep your slides simple (design).
7. Beware of animations and multimedia.
8. Watch your delivery.
9. Choose your words.
One thing Beyond Lab wants to point out here is that it once again recommends serif font just as Tomjoe's comment to one of my earlier posts.
So, use it!!!