Using Python's NLTK and Lucene can produce results like this. I wrote something similar using Wordnet, PHP/Zend Lucene, and and Freeling (C++ NLP) for NewsCup.

Using Python's NLTK and Lucene can produce results like this. I wrote something similar using Wordnet, PHP/Zend Lucene, and and Freeling (C++ NLP) for NewsCup. I think what makes this project interesting to me is the interface and quality of search results. They show a really good understanding how to use NLP and search in conjunction. Nice work.