The Moon Is A Harsh Mistress, by Robert Heinlein

This is the second Heinlein book I've ever read, and I must say I was not let down.

The moon was made inhabitable and is being used as a penal colony. But once the convicts have finished their sentence they cannot leave, because of physical changes that come from living on the low-gravity moon. The story centers around Mike, a computer that has become intelligent and aids a small group of rebels in their fight for complete freedom on Mars.

This book really makes you think back to a lot of earth-side revolutions, and it's amusing to see the moon colonists use the United States so often as a blueprint for revolution. The intelligent computer was really cool as well. I greatly enjoyed reading this book.