Take a look at this guys work. This is some of the best wildlife work I have seen with the 5d. This guy is a master of his craft. A Look Into Nature on Vimeo

Very nice work. Using depth of field to keep the subject sharp while the foreground and background are out of focus really is a huge plus for wildlife photography. Whether or not that is going to be practical to do when the subject is a fast moving animal or bird is an open question, but certainly the 5DMkII opens up possibilities.

Very nice Mark. When lenses did you use for the video shots?

Brant,

Not my work. It was shot by Polvorosa Kline. Here is a link to his website http://www.polvorosaklinephotography.com/Artist.asp?ArtistID=21618&Akey=CETWD4P8