howdy, i know in the uk we have taichifinder and another site that locates a class by your postal code. also it depends on whether you're interested in the self defense aspects too. i think yang style and chen style are the main forms.
this is a playlist i put together on youtube of erle montaigue "teaching" the old yang style". most folk will say class is best and i agree but as far as learning from a vid, i reckon this is about as good as you'll get. erle was the first westerner to get a degree from china and has written and taught extensively the dim mak and fa jing.
http://www.youtube.com/playlist?list=PL5DD6B2748EC7DB8E
he also started the world tai-ji boxing association w.b.t.a. who have instructors all over the world.
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Krishnamurti : With a
Silent Mind
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"There is no psychological evolution: there is only the ending of sorrow, of pain, anxiety, loneliness, despair and all that."