Finder 10.5
Updated in Leopard, the Finder features a UI similar to iTunes 7, which includes Cover Flow and a grouped navigation sidebar (with Devices, Places and Search for bookmarks). Other features include better integration with Spotlight, a new feature called Quick Look which allows one to see what's inside a file without opening it, and a Path Bar that can be turned on. Like most applications in Leopard, it uses the new unified theme, doing away with the brushed metal look from previous versions of OS X.
Several functions have also been phased out. The ability to set arbitrary search locations via an "Others..." button in the Finder has been removed.
Finder 10.5.6, released on the unibody MacBook and MacBook Pros, added additional support for the extended multi-touch gestures introduced.
Read more about this topic: Finder (software)