iVisibilityX Lite is an application that sits in the menubar and allows you to easily toggle the visibility of files and folders.
Just select a bunch of files/folders in the Finder and choose the desired option in the menubar.
If you want to view hidden files in the Finder, simply choose "Show hidden files in Finder" in the menubar.
iVisibilityX is freeware and Universal Binary. It is available in English and Dutch.