Coriolis is easy to understand... throw a ball from the equator to the north pole... when you throw it, you're rotating on the earth's axis from the equator, where it is fastest. As the ball travels north, the earth below it rotates slower, because the radius of rotation is decreasing. However, the ball still has the rotational energy it has when it began its journey... conservation of energy means that the ball will rotate "faster" and drift eastwards.

I'm yet to find a way of easily understanding the centrifugal force, despite it being the more familiar case.