This book does a good job of explaining the differences between Darwinism and Intelligent Design and the differences between Intelligent Design and Creationism.
Intelligent Design is often referred to as just a back door for religion and Creationism by people who support Darwinism, but this referrence isn't true. In fact after reading the book I was disappointed in just how far Intelligent Design is from Creationism.
The author of the book supports Intelligent Design, however, he doesn't support the idea of a literal six day creation. He makes several statements in the book about the earth being billions of years old. I found that disturbing, yet I understand that Creationism and Intelligent Design are two different things and he does a good job of refuting Darwinism.