Action research and business
Recently, Jennifer Laycock of Search Engine Guide started an experiment that could be seen as action research, especially if she iterates on her idea until she succeeds all she wants and learns all she wants. Her goal is "to setup some type of business in my free time and see if I can start to turn a profit in a 30 day period." She's up to day 6 and relating a fascinating tale. Even if it's a business on a much smaller scale than you think about, you might find the approach, the openness, and the lessons she's learning (at least some of them) of interest.
If you're in a medium-sized company or bigger, perhaps the key lesson to take away is to think about how to plan an experiment, how to document it (hint: think learning logs, if you're stuck), and how to observe and reflect effectively on ways to tune your plans so that you both achieve the goals you set and learn something useful about how to achieve change in specific circumstances.