Randonnee race binding such as Dynafit and tech, including Sportiva and ATK can be used for ski touring as well, if you want the super lightweight setup.
Skimo Racing
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Overview of Dynafit alternative lightweight tech bindings for skiing the backcountry.
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Uphill Travel at Ski Resorts
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Breckenridge Ascent Series Springmeier rando race trip report.
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Report from Vertfest ski mountaineering backcountry skiing race, 2010, Alpental Washington.
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Report about 1010 ski mountaineering racing world championships.