http://www.mpdailyfix.com/2007/06/bounce_rate_sexiest_web_metric.html

   * The percentage of website visitors who see just one page on your site.
   * The percentage of website visitors who stay on the site for a small amount of time (usually five seconds or less).

It happens on almost every site, stats that show a visitor came and left after only a few seconds....WHY???

Did the ad campaign mislead them?

Was the term they found you on Google or Yahoo, totally off the wall?

Were your Diggers, stumbleupon, delicious etc. visitors just clicking and going back?

Is any traffic good, even if it is useless or is it better for bandwidth purposes to only attract valid prospects?

Which search engines tends to send visitors that stays on the shortest and longest times?.

Weeks ago, there was differents values for the same site under the name "Bounce rate". I alerted Google about that, they fixed that.

BTW, you don't have to panic if you have a hight bounce rate, because many visitors just go on your site thanks to a search engine, they find information and they leave > bounce++