I've dipped into Gemini to see if it was worth adding to my gopher client[1], but the defined spec is vague and barely complete. I subscribed to their mailing list, and it's really busy - the spec is clearly in flux and developing rapidly.

I'm going to keep an eye on it though.

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[1] http://www.jaruzel.com/gopher/gopher-client-browser-for-wind...