Whilst researching on creating an animated character, i found a really good site which ran through some really good advice and quotes on 3d character animation.
The Integrity of Character
The character body is an integral system so even seemingly separate movements involve the motion of other parts of the body. For example during a head turn in dependence of the situation the character will slightly move his shoulders and his centre of mass. During a walk the entire body will be involved in the animation not only the hands and the legs, even the head will have specific movements.
Acting the 3d Animation to show Personality
The animator is first an actor and only then a technical guru that knows how to put 3d models in motion. With present animation tools, animating a 3d model of living being is relatively easy from a technical standpoint, but showing a distinct personality that has a long history and character that's where the art starts. That's why it is called Character Animation and not Human or Creature Animation. 
When animating try to understand your character personality and feelings.. Spend time acting the animation you work on in front of a mirror until you can achieve believable results only then start animating your character... This is the way to create appealing and interesting 3d animation.
Create the Effect of a Thinking Character while Animating
As in the words of the father of animation motion pictures Walt Disney himself, "In most instances, the driving forces behind the animation are the mood, the personality, the attitude of the character" or all three. We think of things before the body does them."
Every single movement of an animated character creates an impact on the audiences, and that is why it is there for a reason, and is an essential part of the story. It is needless to explain that the very purpose of an animated picture is to tell a story and to make the viewer believe its characters. Unless the movements of a character are not related to each other, the flaw of the animator would become obvious to the viewer and the fact that an animator is behind the characters of the story reveals itself, which takes all the fun out of watching your movie.
According to Walt Disney, a thinking character is what can help make its actions look life-like, due to their connection with a thought process. This also makes these movements look believable to the viewer, who can relate to them. You should understand that it is the mind and personality of the character which is behind his or her actions, which the character thinks of something before he or she does it.
The best tools for an animator to convey the emotions and thoughts of a character are the eyes and the heads of the character. If you need to give the idea to the audience of what a character is thinking and what move he or she is going to make, then make sure you convey the message to them through the eyes by focusing on their movement.
But sometimes you have to deal with 3D models with no eyes and when animating objects like these, the head of the character becomes even more important, when it comes to the movement of the character.
The animator must create the animation while keeping in mind what the character is thinking, and his or her job is to convey the message from the eyes and the head of the character.
For instance, if you are working with the character of a mouse who needs to make a decision on whether or not he should take a chance of plucking off the cheese set on the mouse trap you should allow the character the time to think, and the eyes of the character will be the key to conveying the message while deciding whether the cheese is worth the risk or not.
But head and eyes will not be your primary leads for movement when the character reacts to an external stimulus, such as a bear dodging a large ball. And of course, when the ball strikes the tummy of the character, the impact it will create will cause the body of the character to move backward and so on.
content found on: http://www.3dmd.net/forum/3d-discussion-5707.html