An Ars Technica blog entry claiming that one of Apple's secret Leopard features will be 3d user interfaces sparked a bit of discussion across the Mac web. The article is self-described as "wild speculation" so no specific inside knowledge is claimed. The author imagines: While this is based in speculation, we have heard rumors that much of Apple's new Finder interface will take advantage of the new technologies in Leopard -- specifically Core Animation. Apple is already promoting the use of Core Animation in building better user interfaces. From a WWDC 2007 session titled "Building Animated Cocoa User Interfaces": Apple is already using Core Animation in Leopard's Time Machine and details about Core Animation's capabilities are listed on their site.