Interesting...
Microsoft's new version of Internet Explorer has barred browser plugins in the Metro environment. But Microsoft has revealed a method that plugin-dependent websites can use to leap over Metro's walls and reach the green fields of the conventional Windows desktop, where Flash is still allowed to roam free.
The relevance of proprietary browser plugins is declining as standards-based Web technologies mature. Native Web technologies don't yet supply complete functional equivalence with the capabilities of plugins, but the open Web has the advantage of greater ubiquity.
There are a growing number of mobile devices and computing environments where modern Web standards are supported, but plugin-based technologies like Flash are not. The proliferation of platforms and devices, including some that are locked down like appliances, has made it difficult for plugin vendors to keep up and reach every screen.