I just finished an article on Forbes.com that discusses 20 businesses that you have never heard of that made one million dollars or more last year.  As I looked through each of these million dollar businesses I thought: "had a friend told me this business idea or if I had dreamed up some of these business ideas, I would have had a million reasons why they would never work."  I guess sometimes it is better not to "know" why something will not work.  After reading the Forbes article, the Nike slogan "Just Do It!" seems like a great slogan for trying out business ideas.
Here is the article:
Twenty Million Dollar Businesses that You've Never Heard Of  by Dale Buss, Forbes
"Have a nutty business idea and need some inspiration to pull it off? We went looking for small companies that generate at least $1 million in annual revenue in unexpected ways."  Read More