From a quick peek at their announcements from long ago, it looks like they used to run 64MB as the smallest size, but this was, of course, back in 2003/2004. U

From a quick peek at their announcements from long ago, it looks like they used to run 64MB as the smallest size, but this was, of course, back in 2003/2004. Until 2008 or 2009, they were also still using UML, instead of XEN.