http://www1.cs.columbia.edu/~pablo/hlt-naacl04/

This is the first time either conference has given such an award: according to the General Chair and Subchairs' report, "The PC chairs wanted to give a best paper award, based on the wishes of the area chairs, who felt that one paper really stood out" since it "received all 5's from reviewers and the area chair" and "The entire PC reviewed the paper and thought that it ... was deserving of the award".

The paper is titled, "Catching the drift: Probabilistic content models, with applications to generation and summarization".