Boards
Stephen Soderbergh casts porn star as lead actress in upcoming film
Can you think of any other examples of porn actors or actresses playing the lead role in a fairly major production?
According to wikipedia this girl is playing the lead role in his film The Girlfriend Experience:
http://en.wikipedia.org/wiki/Sasha_Grey
Her biography is really interesting, explaining how she was privately educated and shares her time between various other projects such as experimental music, theatre and film.