Currently, the best way to make search engine indexed RIAs is called progressive improvement.(or elegant degradation, depending on how you see It). Basically, you create a simple HTML version of the application using the same data as the application. This version should be dynamically generated using some kind of server server technology. This HTML version can be indexed by Google, but each page also contains a check that determines whether the visitor can view the extended version, and if so, replaces the HTML content with the Flash, Flex or Silverlight application, preferably so that the application starts in a state when it shows the same data as the current page. "Replaces" means that it simply embeds the application on top of the HTML content or redirects the user to the page into which it is embedded. The first solution is preferablesince the latter can be consideredcloaking .
One way to synchronize the HTML and RIA versions of the store is to choose a URL scheme and make sure that the RIA uses some kind of deep binding method. If a visitor arrives at a specific element through a search engine, let's say the /items/345corresponding pseudo URL in the RIA should be the same so that you can embed the RIA on top of the page and set that URL as a parameter to make the RIA display the same page as soon as it loads.
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