Flash
Flash animation can sometimes be a great way to get your message out better than with just word or pictures alone. But using flash on a site must be done correctly as not to interfere with your search engine ranking.
We use Flash when and where it is necessary, but do not over use it. Adobe and Google are working to make Flash content searchable, but until Flash content is more accessible, we avoid designing a site entirely in Flash. We do, however, use Flash accents on most of the sites we design.