I'm still not convinced by the basis of the Keynesian concept. There is some fundamental flaw to this concept in my opinion, but the Keynesian answer to the flaw is "in the end we are all dead". That may be true, but new people are born every day. It's definitely an interesting book, however it lacks the fundamental evidence to support this theory.
Paul Krugman is definitely a Keynesian and doesn't let you know until about the end of the book. The examples he provides don't really make a lot of sense. An interesting read if you are looking for a different point of view than those who believe in letting the free market work. He believes in the need for the government to spend us out of the recession.