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Joyent Slingshot will allow Ruby on Rails developers to deploy their web apps both on line and off line (on Windows and Mac OS X at least) when it launches in April. This is in a similar category to Adobe's Apollo that I have written about lately. These hybrid web/desktop application technologies are the cutting edge right now, and they are opening up some very intriguing possibilites.
More on Slingshot. Slingshot screencast.