Twin disc front hub?

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Just curious: has any manufacturer experimented yet with a twin disc front hub? Anyone ever hear of it?

My first thought is double the disc and caliper weight. :(

On 26" wheels there's a long way to go yet before running out of disc diameter, do a bigger disc would do the job without all the extra hardware and plumbing.

Hayes have just come out with a 9" rotor, so there ya go.

Just thinking of like a 29er application, where dual rotors might possibly yield an advantage? The hub shell would be fairly easy to manufacture, just have to find a fork with dual mounts.
If motorcycles use 'em, why not DH bikes? An extra 70g ti disc and caliper isn't that much more on such bikes.

http://www.cyclingforums.com/t377924.html

Thanks for the link to that thread, I missed it. Interesting that someone (Shimano) put dual discs on the same side, with 3 pads in the caliper. Kinda like RAID for braking, eh?