I have, however, used aspects of AI on numerous occasions since with different people and organisations and I have to say I've been impressed by the results. I like its emphasis on imagination, positivity and solutions. It fits well with my beliefs from social constructionism about how we create and co-create our own realities. Its discover, dream, design and destiny phases can envision and energise, inspire and motivate people far more than any problem-solving approaches I've seen or used. A simple question such as, 'What has inspired you in the last month?' really can transform the focus and energy in a team.
The best article I've read on the foundations of AI and what it involves in practice is by Richard Seele (2008): An Introduction to Appreciative Inquiry. If you're interested in the AI and to learn more about it, Richard's article is well worth a glance. I have used, adapted and applied aspects of AI without ever having worked systematically through its 4-stage process. I'd be interested to hear from you if you have: what was the issue/opportunity you focused on, how did you approach it, what questions did you pose at each stage, what happened as a result?