Single search box and what else?

Lorcan Dempsey mentions that people are talking about "the attraction of the simple, single box search as the ultimate goal" and his reponse to this is " 'yes, and what else?'.

One of the what elses can be Search without a Box, until that time we should improve the personalized/contextual search, help the users create their own taxonomy, and levarage the faceted searching as we do in Engineering Village Easy Search interface.