Going beyond simple keywords—the next generation of Search Tools - The uses of NLP are at query time and at document extraction time.
"NLP technologies go beyond traditional information retrieval techniques, enabling a system to accomplish a human-like understanding of documents, and thus permitting the extraction of useful meaning from unstructured texts.
Search companies such as Ask Jeeves, Convera, Northern Light, Verity, SmartLogik, Q-Go, and Cognit among others, have incorporated NLP techniques in their commercial search solutions. "
Didn't know about EuroWordNet which is WordNet for French, German, Spanish, Dutch, Italian, Czech, Estonian and English languages. A list of all the Wordnets is available at Global WordNet Association.