This tutorial shows how objects move between keyframes by five different types of interpolation:
translation, rotation, scale, reflection, and inversion.
The Basics + Movie Export Keyframe Animation 1.3
This video shows all the steps in creating an animation,
from setting up the key frames,
to creating the tweens and exporting the animation as a movie.
How to Animate a Rubik's Cube Keyframe Animation 1.3
This tutorial shows how you can rotate several objects in a single operation.
It rotates a "slab" of cublets as a unit about a single point and axis.
How to Rotate Gears Keyframe Animation 1.9
This tutorial shows the basic steps required to make two gears rotate at the appropriate speed so they mesh properly.