"Miracle Planet" on the Science Channel is an outstanding series that I highly recommend to anyone interested in the study of the evolution of life and of the evolution of the Earth itself. This is a new production that has some really cool visualizations... from the continents moving and crashing, to early life forms, to the interior of the planet. It's really well done. As a bonus, if you have Discovery HD, you get the same show in high-def with fewer commercials.
This is probably one of the best series on the subject that I've ever seen; it's a very compelling experience that puts millions of years of planetary history into context.