A select group of webmasters have observed "Related" links under search results. I can't see it myself but Aaron Wall blogged about it, and Barry covered his angle on Search Engine Land.
Here's a screenshot:
Barry notes the following:
It is also interesting to speculate how Google determines to show which related phrases for each result. If you notice, Aaron's seobook.com result shows a related phrase for get more links and if you search in Google for that, seobook.com does rank in the number one position for that search phrase.
Forum chatter is revolving around this observation as well. Robert Charlton says that "the Related queries are in fact queries for which the pages displayed would rank." That's because Google is already in possession of that data.
Forum discussion continues at WebmasterWorld.
