AppleInsider takes a look how Apple has improved the file renaming in Mountain Lion

Along with the new, graphical document selector for iCloud, Preview also shows off two features that resolve a long standing irritation with the complication of renaming files.

Mountain Lion's modernized save and open file dialogs now allow you to rename any files (and folders) in the standard file system directly, rather than having to make a trip to the Finder. Just click twice and the name becomes editable.

  Inside OS X 10.8 Mountain Lion: a Preview of how Apple is improving file renaming