Every Flasher fight over issue of Flash not being seen by search engines. Even that’s true when you consider just plain SWF file that is completly untrue if you serve your information well. I’m sure you know about serving alternative content. Another great solution which more complements with alternative content is Sitemaps.
I will quote what they say on Sitemaps.org :
“Sitemaps are an easy way for webmasters to inform search engines about pages on their sites that are available for crawling. In its simplest form, a Sitemap is an XML file that lists URLs for a site along with additional metadata about each URL (when it was last updated, how often it usually changes, and how important it is, relative to other URLs in the site) so that search engines can more intelligently crawl the site.”
As I’ve heard Google, Yahoo and many others are seeing this XML file so there is really nice solution to help Flash site be more seen by search engines. Visit Sitemaps.org and find out more.