Macenstein publishes a screenshot from the latest build of Mac OS X Leopard 10.5.2 that reveals that Apple has included a List-View into Stacks. Stacks is a file organization feature introduced in Mac OS X 10.5 (Leopard).
Apple Adds List View to Stacks in Leopard 10.5.2
Apple Adds List View to Stacks in Leopard 10.5.2