My piano teacher made me play scales unisono with both hands over two octaves forward and backward, but with a twist: play one hande straight and the other one syncopated. Then the other way around. In itself it may seem boring but at the time it was a real challenge.

Also, we used Bartok's Mikrokosmos mainly. Many pieces in it seem to be targeted at excercising independence of left and right hand. Listen here and esp. the first two pieces here from the beginner level book II. Mikrokosmos is fun to play and it's great music, too.

My piano teacher made me play scales unisono with both hands over two octaves forward and backward, but with a twist: play one hand straight and the other one syncopated. Then the other way around. In itself it may seem boring but at the time it was a real challenge.

Also, we used Bartok's Mikrokosmos mainly. Many pieces in it seem to be targeted at excercising independence of left and right hand. Listen here and esp. the first two pieces here from the beginner level book II. Mikrokosmos is fun to play and it's great music, too.