M.I.T. officials like to tell about an unsolicited comment they received one day about the online course “Introduction to Solid State Chemistry.” “I learned a LOT from these lectures and the other course material,” the comment said. “Thank you for having it online.” The officials did a double take. It was from Bill Gates. (Really.)....Mr. Gates, the former Microsoft chairman, is not exactly M.I.T.’s target audience. Part of its original intent was to provide teachers with the raw materials to lead a course, especially in the outer reaches of the globe.In my own experience, a willingness to stay open to all comers and to explore connections has paid off in new clients and revenue, ideas and guest content for my blogs, and a database full of contacts and experts willing to help me publicize my services. What will you find when you stumble over your unexpected audience? I'd love to collect your experiences in the comments--please share your insights.