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Kensington...I have two, one for my MBP 17" (yep it takes the weight fine) and one for my air.
 

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I'm not sure if you'd qualify this as a "riser" (it's also a cooling pad), but I bought this by Cooler Master a few months ago and it's been great. I have the 17" one. The fans clip off and on so you can adjust them as well (or take them off altogether).

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on Amazon.com
 
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