SproutCore is slick; has a RoR + Apple pedigree & leverages Javascript very nicely. MobileMe integrates it. Apple contributes heavily to the project. Silverlight, AIR, and Google Gears compete. Silverlight and GG require browser plug-ins. Only GGs is open-source. Here's a good overview: http://rapidappsgroup.com/content/desktop-web-applications-using-sproutcore/
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