Enrico Valenza, winner of the animation award of the Blender Animation Festival 2005, has written a tutorial on the character animation of 'PengZilla', the dancing penguin/bird character in his winning movie.
You have to bring your own model to work on, but he covers many topics such as
- Rigging the character
- Setting up actions for the Non Linear Animation [NLA] tool
- Working with weight groups
- Setting bone influences
You'll find the tutorial on Enrico's site.