Creative Commons is investigating how people understand the term “non-commercial”, and as part of their study they have a survey up. I just finished it, and it took about fifteen minutes. It was interesting, and I can only presume that they are gauging a wide range of perceptions towards the term, and some of the questions boggled my mind, such as whether an objectionable use of your work would be commercial. Huh?
Anyhow, the survey is at http://v2.decipherinc.com/survey/mds/mds08002?list=2. Help out CC by filling it out! ^_^