Flash can be used to add a sense of interactivity or draw attention to something specific such as a call to action.  Too many bells and whistles will distract or annoy the user; therefore using the right amount of Flash is the key to a successful interaction with your audience.  An intro, or Splash page, can describe your company in a few seconds.  Using Flash text and image movement on your site creates a very appealing look.  A Flash gallery or slideshow will display your images nicely with easy to use controls.  And Flash demonstrations can sum up your product, company or service.