rox-filer has been very useful in converting a family member from Mac OS 9 to Linux. Turned it into an app launcher that is reminiscent of Mac OS 9 by creating a hierarchy of directories with symlinks to apps in each category, and also a desktop icon that starts up rox-filer at the toplevel directory. Then you can navigate around the various categories and launch apps with a single click, or drag a file onto the appropriate app icon and have the app open it. She much prefers this interface over the wavy dock-like thingy in Mac OS X.