Remember klik? That project that aims to make Linux end-user software installation and usage more easy than on any other platform? "Grandma-proof", if you like? By making to 'install' an application as easy as copying a single file to a USB thumbdrive or to a different computer? By implementing application-level virtualization, encapsulating each end-user program into a single file, following the 1 application == 1 file principle?