Upon reading Imperial Earth, I could not help but think of how 2001 the book and the movie were so different - and that this book, written shortly after the movie premiere was in many ways a second try for Clarke to bring life to Saturn.
Though that doesn't deter the quality of the book at all.
Clarke introduces time-old experiences of life in a colony against a vast, yet remote empire - paralleled mildly to the three hundred year ago colonization of the Americas by the Britsh empire. In Imperial Earth, these ideas of colonization are reminded over and over again - from the comminque and travel time difference from Titan to Earth, to the sheer isolation that Titan has as a community within our solar system.
The part I enjoyed was Duncan's time while on Earth. I especially like the company Enigma - makes me wish we had a company like them now!
On whole, Imperial Earth is an enjoyable read, enough to spend an afternoon with, but not deep enough that you will live with it long after you read the final decisions that Duncan has to make.