According to the AdSense Blog, Google has added a new 200×200 size ad format that is being dubbed the “small square.” The new format will support text, video and image ads and could be a handy addition to the layout on some publishers’ sites. Google has also done an overhaul to the channels page to help makes management easier. More information on the new channel interface is available in the Help Center and the new ad unit size should show up shortly.