Thanks to the generous contribution of Oz Benamram, we've been given some insight into their amazing tool at Mofo, AnswerBase. Built on the Recommind search engine, AnswerBase is the most comprehensive search tool built by a law firm (at least as far as I'm concerned). It aims to make it easy to find and drill down on anything relevant to a user's search term. It goes beyond searching the full-text of documents, finding related documents by industry, experts on the particular legal topics involved, etc. Click here to download the viewlet which gives a nice overview of the tool.
I'm shooting for "Oz-light" with our SharePoint enterprise search initiative, wish us luck!