i remembered this thread when i saw this relating not to work and play, but to working 3 sheep vs. the yard. there are a few good videos on stock dogs with geese, sheep and cattle. i know it's on the west coast, but there is an awesome stock dog trial at the red bluff bull sale every year as well as a sale. a guy that does good every year is Roger Urricelqui
who has kelpies, my favorite dog.
http://forums.dogzonline.com.au/index.php?s=4f00ce9be0d903869cf2f478fc859707&showtopic=61717&st=30&p=977567&#entry977567
here's Roger's
website
http://www.kelpiesinc.com/urricelqui/urricelqui1.htm