Informational Question:

☛ Keep records. Right after the interview write down what you learned, what more you'd like to know and your reactions in terms of how this industry, field or position would "fit" with your lifestyle, interests, skills and future career plans.
☛ Send a thank-you note within 1-2 days to express your appreciation for the time and information given. Based on whether the informational interview was relatively informal or more businesslike, this may be a brief handwritten note, an email, or a business letter.
☛ Keep in touch with the person, especially if you had a particularly nice interaction; let him or her know that you followed up on their advice and how things are going as a result. This relationship could become an important part of your network.