WCF RIA Services and JSON endpoints
Developer & Design Tools will evolve to simplify and give much more productivity, but this is the technical base for many future Internet scenarios.
I still have to test this stuff out… We’ll see…
On the other hand, WCF RIA Services & Silverlight is still the best choice for LOB apps (Enterprise apps, Line Of Business Apps), especially ‘Out of the Browser’ (Windows). VS.LightSwitch is another RAD tool being released this summer of 2011, and it bets on Silverlight.