Many site owners are not aware that having full flash sites can sometimes hinder to search positining success or ranking with the search engines. Having a small portion of flash on your site to enhance it, like an animated header graphic or just a section on the homepage is perfectly fine, people with full flash sites (entire site is built with flash) may suffer in rankings. Here’s what Google says about flash:
Google indexes pages that use Macromedia Flash. However, our crawlers may experience problems indexing Flash pages. If you’re concerned that Flash content on your pages may be inhibiting Google’s ability to crawl your site, you may want to consider using a text browser such as Lynx to examine your site. If features such as Flash keep you from seeing all of your site in a text browser, then search engine spiders may have trouble crawling your site.