I may have to do a case study on this soon, but I had a client implement alternate content on their all-Flash site so that they'd be easier to index and rank. Initial results one month later are overwhelmingly positive. Check out how it's done here: http://www.swellpath.com/2011/11/seo-alternate-content-for-flash/
Learn how to provide SEO-friendly alternate content for Flash using SWFObject2 to boost your site's SEO and ensure a great user experience.
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