iVisibilityX allows you to easily toggle the visibility of files and folders.
Just drag and drop a bunch of files/folders on the window and iVisibilityX will make visible files invisible and invisible files will be made visibile.
If you want to view hidden files in the finder, simply tick the box in front of "Show hidden files in Finder".To hide them again, simply un-tick the same box.
iVisibilityX is freeware and Universal Binary.It is available in English and Dutch.