As you can see, the search navigation is currently on the left side of the screen, where it has been for some time. However, it appears that Google is testing a new search navigation setup with a small subset of users. Here is what that test looks like for those who are seeing it.
The navigation here is now above the search results, opening up the left side of the page for what Search Engine Land believes could be ad space, or an alternative location for the knowledge graph. My pick? I actually believe Google will try to bring the Google+ experience over to Google's search results page by placing the Google+ sidebar in that empty space. That is, of course, if the new navigation design sticks. Google tests changes like this one all the time, and most don't make the cut.
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