1/ Produce a wire-frame animation for the client to 'sign-off'
2/ Produce stills at various parts in the animation for the client to sign-off (say every 1 second). This will ensure all your textures are correct through-out and there is no surprising movement, collissions or gaps.
3/ Render to 'animation' format or 'none if you have the space.
4/ Interlace or blurr in after effects 4 or 5.x
5/ Alow 6 times as much time as you think it will take!