caríssimos, SEO (Search Engine Optimization) é fundamental para tudo o que fizermos na web.
aqui vão duas referências que hão de ajudar vocês:
Search Engine Optimization for Silverlight applications
Figure 1 - Search engine results page
The goal of search engine optimization (SEO) is to increase the chances that your page will appear in the main section of the search engine results page (outlined by the red rectangle in Figure 1), not the paid or sponsored results. The Official Microsoft Silverlight Site
Search for Rich Internet Applications
It is interesting to see the buzz - it is good to see search engines at least begin to think beyond indexing static HTML. Technically speaking, this sort of approach to indexability lends itself to Silverlight apps as well pretty easily. First a Silverlight application packaged in a xap file is easily cracked open without a special SDK - it is simply a zip file after all. Any static textual xaml content is easily parsed by virtue of being XML. Second it is easy to embed and extract metadata via an additional file within the zip archive. Third, the Silverlight DOM itself can be easily walked and inspected programmatically to detect all text, links and images that are being visualized by the control. http://www.windowslivetranslator.com/BV.aspx?ref=IE8Activity&lp=en_pt&a=http%3a%2f%2fwww.nikhilk.net%2fSearch-RIA.aspx