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Mar13-08, 11:37 PM
Sci Advisor
P: 1,253
Tidal Locking is an expected phenomenon in systems with satellites, such as the Earth-Moon system. Eventually the Earth will become tidally locked to the Sun for instance (actually this assumes the Sun will last forever since tidal locking would take Billions of years). The Moon didn't start out being tidally locked, but this is the lowest energy configuration and hence what the system moves towards, it doesn't require any chance agreement between the initial orbital speed and rotation.

There is some info on Wiki under 'Tidal Locking' if you are interested.