I enjoyed the Discipline of Market Leaders it really makes you think about what value proposition you are embracing. In his book he reviews how winning firms focus on one of three customer value disciplines: product leadership, customer intimacy, or operational excellence. Trying to be all things to everybody is tantamount to being nothing for anyone. If your firm can't get its act together, you'll find this an inspiring book that makes a compelling case that success is only possible by having the courage to focus on specific tasks & disciplines