Ancestral vs. Original Sin

There is a very interesting post over at Razilazenje on one of the questions that has frequently divided East and West--"ancestral" vs. "orginal" sin (don't worry, the article is in English). In light of some recent comments on this blog, I thought I would pass it along and see what you thought about it (esp. Ian and CA). How might this illumine the discussion in recent comments here on the Immaculate Conception?