Neddick is part of the Fogcutter suite of tools for building intelligent applications. Neddick provides tools for tagging, ranking, discussing and discovering various sources of knowledge: web-links, documents, people, etc.
It's over-simplifying a little bit, but think of Neddick as sort of a combination of Reddit, Delicious and Planet. Mix in a powerful search engine, and a recommendations engine, and it lets you categorize, rate, tag, filter, discuss, and discover the knowledge in ways that most enterprise search applications can't. Point Neddick at the RSS feed coming from your Document Management System, feed it some web-links, post some questions, tag some article, vote some things up or down, and let Neddick help you discover the knowledge you need.