Interesting 45 minute 'felling a tree' video from Husqvarna.
http://www.youtube.com/watch?v=Teb2bQsqx44
I'd always advocate training in person with a qualified instructor as opposed to teaching yourself by watching videos. That said, I found this useful as a refresher of things I may not have done that often or not done recently.
Some things I hadn't seem before, in particular, at 2:38 (that's 2 minutes 38 seconds in) gauging how far away the top of a tree will end up, at 41:20 using a wedge to lift either side of a cross-cut of a butt lying on the ground, and at 41:45 a tongue and groove cut.