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A lot of devices are MHL compliant. You noted the Sony Tablet, and most new LG, HTC and Samsung tablets/smartphones are as well. On the display side, HDTVs and displays from the majority of major brands support MHL. I found a list of current of MHL enabled displays. It’s pretty extensive, so I don’t think this is a flash-in-the-pan tech fork. It makes sense from a manufacturer’s standpoint; they can use the micro-USB hardware that every device already has instead of spending extra money for HDMI hardware.