Amit Agarwal reported seeing “tags” in the Google search results, directly under each search snippet. The tags appear to show related queries based on each snippet listed in the search results. If you click on a specific tag link, it takes you to a new page of search results for that new query.
Here is a picture:
I emailed Google for a statement on this and I have yet to receive a response. My first instinct is to say this is some browser plugin or extension messing around with the search results. But it is very possible that Google is indeed testing out a new form of related search expansion.