Microsoft Silverlight
Picking the was no easy task. Our prize goes to Silverlight because it beats Flash in runtime performance; it has a modest download size; the design tools are good; it boasts wonderful .Net language support and a best-of-breed development environment in Visual Studio 2008; and although Silverlight's capabilities as a desktop RIA are weak compared with those of Adobe AIR, developers can write Silverlight RIAs that can be recompiled as excellent WPF (Windows Presentation Foundation) desktop applications.

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