We recently spotted Google testing the search bar navigation on the left hand side...
Microsoft Bing has moved the “explore more” feature from under the image carousel snippet to the left...
Microsoft Bing is testing the “see results for” feature on the left hand side. The same place...
Google may be testing displaying images thumbnails on the left side of the search result snippets. ...
Microsoft Bing is testing placing the related searches list on the left side of the search results...