关于大会最佳论文（Best Paper Awards），在其Handbook上有如下描述：
“In the ACL and IJCNLP traditions, one or more of the conference’s scientific contributors will be awarded Best Paper Awards. The conference also recognizes significant student contributions through Best Student Paper Awards. The recipients will be announced in a plenary session at the end of the conference and will receive a certificate."
U. Germann, M. Jahr, K. Knight, D. Marcu, and K. Yamada: Fast Decoding and Optimal Decoding for Machine Translation
Franz Josef Och, Hermann Ney: Discriminative Training and Maximum Entropy Models for Statistical Machine Translation
Yukiko Nakano, Gabe Reinstein, Tom Stocky and Justine Cassell: Towards a Model of Face-to-Face Grounding
Dan Klein： Accurate Unlexicalized Parsing
Diana McCarthy, Rob Koeling, Julie Weeds and John Carroll: Finding Predominant Word Senses in Untagged Text
“In this paper they develop a method for selecting the predominant sense of a word from a corpus without sense annotations, using unsupervised thesaurus extraction techniques. The paper was rated highly by the reviewers and PC on quality and innovativeness, and was selected also because it combines two important topics in our field: unsupervised learning and robust semantic analysis.”
David Chiang（蒋伟）: A Hierarchical Phrase-Based Model for Statistical Machine Translation
“This paper takes the standard phrase-based MT model that is popular in our field (basically, translate a sentence by individually translating phrases and reordering them according to a complicated statistical model) and extends it to take into account hierarchy in phrases, so that you can learn things like “X ’s Y” -> “Y de X” in chinese, where X and Y are arbitrary phrases. This takes a step toward linguistic syntax for MT, which our group is working strongly on, but doesn’t require any linguists to sit down and write out grammars or parse sentences.”
Rion Snow,Daniel Jurafsky, and Andrew Ng: Semantic Taxonomy Induction from Heterogenous Evidence
Y. W. Wong and R. J. Mooney: Learning synchronous grammars for semantic parsing with lambda calculus
Liang Huang（黄亮）：Forest Reranking: Discriminative Parsing with Non-Local. Features. In Proceedings of ACL 2008.
按ACL08官方文档的说法，本年度的大会最佳论文称之为“Outstanding Paper Award”，并且同时授予了几篇，我只找到黄亮博士的这一篇获奖文章，欢迎补充。