Chen stylist Wang Zhanjun applying some excellent technique.

http://www.youtube.com/watch?v=phLBusl2BRA

Nice.

Lots of tripping/displacing with the thighs. One of the things I love about Tai Chi is the emphasis on throws & projections that use stepping to block with the thigh against the opponent's thigh. Much safer and quicker (IMHO) than ankle or leg sweeping where you are on one leg for a second, or going in for a full hip throw where you can't help but narrow your base and turn your back partially for the throw. Also harder for the opponent to step out than with a sweep or hip throw--less time to step out than in a hip throw, and you have to step higher to avoid it than for an ankle or leg level sweep.

Only down side I can see is,as has been said on these forums, that thigh dumps tend to be lower amplitude an so less injurous to the bad guy (though there were some nice fairly high amplitude thigh blocking throws in the clip--which was cool!).