I personally would change https://github.com/reactjs/react-tutorial/blob/master/public/scripts/example.js#L123 to be <CommentBox resource="comments.json" pollInterval={2000} /> but I'm new to React so I'm not sure if url property is a convention or can be anything.

What do you think @zpao ?

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This looks great, thanks! I'm going to hold off on merging until we get the tutorial on the site ready to go (which I think needs a bit more work than just updating the code - we should make the need for a server even more obvious).

Going to close in favor of #79 and coordinate the tutorial update with that. Sorry I let this sit for so long!