Building Watson - A Brief Overview of the DeepQA Project

This is useful and interesting in its own right, but for context you might want to look at these articles/submissions:

http://news.ycombinator.com/item?id=2003332

http://news.ycombinator.com/item?id=2003637

http://news.ycombinator.com/item?id=2003930

http://news.ycombinator.com/item?id=2004407