We give you the option to set your listings main photo. To change it all you have to do is find the listing on the "My Listings" page and click "Edit Photos".
You will see the photos that you have uploaded and below will show MAIN [x]. To change the main photo all you have to do is click the [MAIN] link under the photo.
This photo will now be shown as the main image in search results and on the listing.
Added in How-Tos on 31st Dec 2010