I highly recommend the book Business Model Generation (Amazon Link), it is an invaluable tool in examining your business, new business ideas, new product ideas, etc. They basically divide a business into the following canvas that helps you sort everything out, take a look at the canvas which will explain everything.

The book rocks because they go through so many examples based on companies like Apple, Google, Skype, etc. And through different business models and business model theories such as freemium, open businesses, multi sided platforms, long tail / niche, unbundling models, etc. Just great stuff that spawns ideas. I ended up with about 5 pages of notes to think about on some of our current businesses.

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