Jeremy Ernst shows off his rigging work on Gears of War 3.
Jeremy has also put together a PDF for his GDC 2011 presentation, which has a ton of great info in it.
http://www.unrealengine.com/files/downloads/Jeremy_Ernst_FastAndEfficietFacialRigging2.pdf
Thanks to slipsius for the heads up on the PDF.
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Impressive stuff!
http://www.unrealengine.com/files/downloads/Jeremy_Ernst_FastAndEfficietFacialRigging2.pdf