A new big change is being discussed on the Ayatana mailing list: single click for opening files and folders in Ubuntu (not Kubuntu - which already uses single click for opening files and folders). In fact there are 2 separate threads: one about defaulting to single click for opening file and folders and another to use a single-click mode for all GNOME applications - but only the first one seems to be seriously taken into consideration. The rationale behind this is: