The real problem seems to be the crawlers/spiders aren't keeping up with the technology. I would bet that Google is taking the lead on this because of their lov

The real problem seems to be the crawlers/spiders aren't keeping up with the technology. I would bet that Google is taking the lead on this because of their love for JS. We will just have to keep pushing them for updates that can index routed JS content. I think the main hurdle is that it requires more machine resources because now they have to run JS in order to see the results. That being said, if SEO was a big deal to me, such as when I create an e-commerce site, I would use progressive enhancement and some of the semantic-web enhancements to describe my content because sales drive development. I've done that in the past successfully. But I've also just finished an entirely JS-based single-page-application because we didn't need SEO, as everything was hidden behind a login, like facebook. My point? I don't think one size fits all, yet.