World of Apple published some of the screenshots of the Developer-Preview of Max OS X 10.5 Leopard, the new operating system of Apple which will be released in October 2007. On the screenshots you can see the new iChat design, the dock menu by Stacks, the improved user surface in Time Machine and VoiceOver Utility. Also you can have a look at the new 3D-Dock side edge look.
You can see these screenshots, as I said, on World of Apple, here’s a hyperlink to that website.
