There is a very interesting question asked at stackoverflow.com with the subject same as title of this entry '

You can visit the original question here 

I would certainly like to post the live result from stackoverflow here

interesting isn't it?

This is part 2 of the Mantras for startup product presentation. The original link is

 http://www.techcrunch.com/2008/09/01/how-to-demo-your-startup-part-two/

and key points are

1. Show your product functionality instead of just telling what it does.
2. Use 'We' instead of 'You'
3. One driver, one navigator i.e. Presenter should have one other person to change slides/presentation
4. Know How to handle technical issues
5. Initial Setup, starting the presentation
6. How not to start your presentation
7. Describe your product n times.
8. Change your tone time to time

Here is very nice article posted at techcrunch

http://www.techcrunch.com/2008/08/09/how-to-demo-your-startup

Here are the main bullet points

• Show your product within the first 60 seconds
• The best products take less than five minutes to demo 
• Leave people wanting more.
• Talk about what you’ve done, not what you’re going to do.
• Understand your competitive landscape–current and historical.
• Short answers are best.
• PowerPoint bullet slides are death
• How to use this new device called the phone.
• How to handle questions you don’t know the answer to
• Always confirm the time of your meeting/call, and always be 15
  minutes early.