eisai_xaso provided the link to these pictures, but I think I know who the "unkown actress" seen in the segundo picture further down the post is. Is it just me o is that Gabriella Bussoni, the woman Jack kissed the night Sarah left him?
The articulo presents the pin theory as a part of an effort to provide explanations on the season 5 spoilers. This is also available in Lost-theories.com