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Re:Developer's dream come true: New MacBook Airs now support... by bingbing on Wednesday June 20, 2012 @05:52PM (#4139311)
Monoprice has this:

http://www.monoprice.com/products/product.asp?c_id=101&c...

It doesn't support chaining more thunderbolt devices, though.

Re:Developer's dream come true: New MacBook Airs now support... by veemjeem on Wednesday June 20, 2012 @06:03PM (#4139355)
All this does is split the video into 2 identical signals. Note their fine print: "the two outputs of this monitor will always be the same"