It’s quite likely that you sit and think about your customers,  what are they like?  are they type A or type B personalities?   Are they as impatient as i am when they are shopping for something online?   Take the next 20 seconds to put yourself in their shoes and imagine they are in the market for what you are selling.
Now go to your own web site and see if you can get the answers to these questions in less than 20 seconds.
  •     What makes it unique?
  •     How does it look?
  •     How does it work?
  •     How is it used?
Of course, it may not be possible to get all this information across in just 20 seconds, but shouldn’t you try?