Scott Adams of Dilbert fame has made his book God's Debris (2001) a free download. The price is right and the book is interesting. He calls it a thought experiment around the questions:
What if there was someone who knew everything?
What is God?
What should I be doing?
There's a few choice words about relationships and what each of the genders think about the other.
The follow on "The Religion War" is still a paper book.
I think it cost me about $3 to print the PDF and I think it was well worth the money, effort, and the time spent reading it.