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Do
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Outline
 Refer to it again and again
 
1-3 minutes/slide

Slides are to enhance, not provide everything

Figures
 Large axis labels
 Describe axes

Who/Why/How/What/What results

Elegant finish: "Thank you" which is a cue for clapping; otherwise audience unsure

Know your audience in advance!
 Start out slow to make it accessible to entire audience, and then ramp up.
 Avoid jargon when speaking to the less-experienced (e.g., students, physicists, etc..)

Know your technology in advance!
 Check technology
 Have pdf as backup (reliable way to invoke slide "animations")
 Test how easy it is to see color images in the dark.  I've heard way too many presenters say, for example, "Wow, that doesn't look good on the screen".
 John Wheeler used to pre-fill all the blackboards with detailed/colored pictures/diagrams, and then methodically go through each blackboard.

Double view using laptop
 But be prepared for last-minute surprises in technology/viewing!
 
Have back-up slides for anticipated questions


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Don't
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Go too fast
 AAS disaster example: 45 minute talk in 5 minutes

Overcrowd with text

Belabor co-author help unless particularly illuminating (e.g., your student did a lot of work and he's/she's looking for a job!).  
 Explaining co-authorship is a bit tedious.
 Simply include them in front page text

Get carried away with animations

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Standard public speaking tools:
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Practice to friends/peers
 Anticipate questions

Joke to get comfortable

Eye contact

Face the audience when speaking