Randy Alcorn is abundantly qualified to write this book. He participated in a peaceful protest of an abortion clinic that led him to be sued and sentenced to pay the clinic millions of dollars which he refused to do. The only way that he could avoid funding abortions was to make only minimum wage which he immediately did, resigning his pastorate and refusing his book royalties. Basically the closest a protestant can get to a vow of poverty. He learned to live with much less than he was used to and at the same time learned to give with less. So out of this background what he says about money and giving come from a place of personal integrity and experience.
The central thrust of the book is what he calls the Treasure Principle: the idea that you can't take it (money/possessions) with you - but you can send it on ahead.
He then unravels the Bible's teaching on the use of money throughout the book giving six treasure principles. I found the book very helpful personally and as a tool for a sermon series that is in the works.
Highly recommended for all Christians in our materialistic culture.