Those videos are all on the Toyota / Tundra website.
I'm a little curious why the tests use the optional 5.7L engine on the Tundra w/ the standard 5.3L on the Silverado, and not the optional 6.0L. The GM 6.0L w/ the Max Towing package would be a better comparison, and closer in price to the Tundra.
My bad. I went back and looked at the original videos on Toyota's site (much better quality, btw), which also included the details of the competition's engines. That video was evidently done w/ the Silverado 6.0L, though they didn't mention gearing on the Chevy (3.73s are standard). I must've been thinking of the MT comparison, but the 4.3s and 6spd on the Tundra, combined with a little more umph power-wise, would definitely give it an advantage off the line.