File Hider X for Mac

From Black Magik Software:

Hide your files from prying eyes! Black Magik File Hider is a fast and easy to use utility that allows you to "hide" selected files and folders on your Macintosh so that they cannot be seen by casual observers. File Hider can also be password protected so that only you can "unhide" your files. The password feature even allows you to enter a clue to make it easy to remember your password.

Simply drag your sensitive files or folders into File Hider's list and watch your files vanish. When you need to access one of your hidden files or folders, launch File Hider again, enter your password, drag the desired files out of the list, and watch your files pop back into existence.