Got my preorder of the Planet Earth HD DVD from Amazon last week, and I haven’t been able to stop watching.  Here’s a mesmerizing clip of a great white shark devouring a seal from the first episode, slowed time 40 times:

Although Attenborough doesn’t provide any social commentary, the show does allude to the effects of global warming. One episode shows a polar bear unable to walk far enough out to shore to hunt for seals due to the ice melting too early — the bear is forced to swim out into to the ocean to look for food. You’ll see what it desperately tries to do out of starvation in the trailer.