Punakea is a to help you cope with the day-to-day struggle of managing your files.
Designed to complement Spotlight, it allows you to tag your files and bookmarks, freeing you of the Finders folder strict hierarchy.
A tag is like a keyword. Tags can help you to group files which have something in common. You can assign as many tags as you wish to each file.
Free for Mac OS X 10.5 or higher