Consider this: in just a few short years, the open-source encyclopedia Wikipedia has made closed-source encyclopedias obsolete — both the hard-bound kind and the CD-ROM or commercial online kind. Goodbye World Book and Brittanica.
Cool! I am here now with the 100% completed release upgrade of Xubuntu from release 11.04 to release 11.10. In the new release, LightDM replaces gdm as the login display manager (but you can choose, during installation, to continue to use gdm if you so prefer it).