Rated 5 out of 5 stars
This is one of those brilliant "Why didn't someone think of this a few years earlier?" add-ons. I have set my Google search results default to 50, so in regular Google search and news, you get the "big picture" real quickly. This is one application where tag clouds make sense, and the ability to add terms to your query (click in the left part of the word) or remove them (click in the right half) from said cloud is the most intuitive way to search.
Great work, guys!