Microsoft Silverlight 3 is shaping up to be a very impressive release. While Silverlight 1.0 was a relatively narrow-purpose release, relevant mostly to streaming content delivery on the web, Silverlight 2.0 delivered a workable general purpose, cross-platform programming environment that leveraged the growing skills of .NET/WPF developers. But Silverlight 2.0 lacked many features and controls that WPF developers depended on, and it violated the WPF subset principle that Microsoft had set for itself to ensure that Silverlight applications could cross-compile with WPF.

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