GoogleGuy says the testing of a new "related searches" feature is currently an experiment.
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It's an experiment that we're trying (note that some scumware does do things like attach a new frame to your browser and try to look like a search engine, but this experiment is by Google). I think HayMeadows had a screenshot in the other thread:
michael_heraghty, we're happy to get suggestions from anywhere. An internal group came up with the idea for this experiment, but from all the times Brett has mentioned related searches, I knew he'd be happy about it. ;) It is an experiment right now, so only a small number of users get the suggestions right now.