I keep books with me. They're in separate rooms and at work so I read a lot of different ones. Currently, I'm reading 4 books - slowly.
The God Delusion
The Screwtape Letters
The Courage to Change (AA, NA support devotional)
The Dawkins Delusion
I'm a scatterbrain and this probably isn't good for someone with a short attention span but that's what I have to do to keep me interested.