Web search engine Quintura has introduced a tag cloud to its search results allowing users to see associated terms. Interesting this allows the user to excude terms that are not relevant to their search easily quickly reducing the number of results and increasing the relevance.
The search seems to be a bit hit and miss currently. Sometimes when I excluded words I thought had nothing to do with my search sites I thought highly relevant disappeared. However, the functionality is interesting and allows the user to easy search by excluding irrelivant content filtering results.