Dan Sharp at the Search Engine War blog noticed Google testing a new type of Sitelinks format. Google Sitelinks are the links you find under some of the Google search results. Typically, they are listed out in two columns and four rows, directly under the display URL. To see it in action, try this query.
But Search Engine War noticed Google testing four sitelinks on a single line (one column), directly under the snippet and above the display URL. They have a picture, which I seem to not be able to reproduce here.
What I find interesting is that this format is one the the earliest test implementations of Google Sitelinks, even before they were named Sitelinks.