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I'd hold off and see how it goes. The community really needs to adopt a third-party resource like JSFiddle before it's appropriate to add it to a tag wiki.
When you add it to your own answers make sure you provide complete code in your answer and add the external link as a reference only. Also, make sure you disclose your affiliation with the site when you use it in your own answers.
There is an option I've used quite a bit for SQL answers, but unfortunately questioners have not: http://data.stackexchange.com/stackoverflow/query/new