Informational interviews are vital tools in your arsenal of job search weapons. They can also help you through the process of discovering what you want to do in your career.
Remember, you are asking a favor from a professional in the field that you are interested in, to spare some time out of their incredibly busy schedule. How do I know they are swamped? Because you only want to talk to over-achievers, they are more in the know, have more relevant experience, and are more influential in both their company as well as their industry.