Google's Inside AdSense blog has a terrific case study on a site that made a small change with a big impact as a result.
The owner of the site was using Google's SiteSearch for displaying search results on his pages. A few minor changes were made, including moving the search box to a more prominent location (from the sidebar to the center of the page - see image below) and extending it to twice its original width. In addition, some aesthetic changes were made to the search result pages, including removing the borders around the sponsored ads themselves.
The result of these small (fifteen minutes total) changes?
The number of queries increased and that ultimately led to more clicks on sponsored listings. It makes you wonder what sort of small changes you could make on your own site that would produce a positive result, doesn't it? Share with other WM readers (by commenting) the small changes you've made recently on your site and what impact it's had on the bottom line - good or bad.
Below are some before and after shots of the search box change: