About a year and a half ago I released my film Sita Sings the Blues under a Creative Commons Attribution-ShareAlike license. That license allows truly free distribution, including commercial use, as long as the free license remains in place. But my experience is that most people see the words "Creative Commons" and simply assume the license is Non-Commercial -- because the majority of Creative Commons licenses they've seen elsewhere have been Non-Commercial.

This is a real problem. Some artists have re-released Sita remixes under Creative Commons Non-Commercial licenses. Many bloggers and journalists assume the non-commercial restrictions, even when the license is correctly named:

The film was made available under a Creative Commons Attribution-Share Alike License, allowing third parties to share the creative content for non-commercial purposes freely as long as the author of the content is attributed as the creator of the work. --Frontline, India's National Magazine

http://www.techdirt.com/articles/20101020/09352711499/creative-commons-branding-confusion.shtml

Ciao,
Paolo