Crista Cowan of Ancestry.com has a new youtube video up explaining the new matching system and the new dna circles based on autosomal dna matching system. It runs about 27 minutes. Although much of the information she shares is in written form in various help tabs on the dna pages, for those who like video presentations that show exactly where various tabs and buttons are, it can be useful (i.e. rather than "look on the left side of the third tab instructions")

http://www.youtube.com/watch?v=GSnGzLCgmw0&feature=youtu...

Interestingly, she mentioned that in the last 24 hours, 2500 people had either made their trees public or uploaded a tree (required to do the circle function).