Links

GDM Themes: http://art.gnome.org and http://gnome-look.org

Footprints, GNOME User Site (with user forum and community-written docs): http://www.gnomedesktop.org/

KDE Forum: http://www.kde-forum.org/

KDE Community Wiki (documentation): http://wiki.kde.org/tiki-index.php

Konqueror: http://konqueror.kde.org/

Nautilus Docs: http://www.gnome.org/learn/users-guide/2.6/ch02s06.html

The Mysterious Linux File Structure Explained: http://www.freeos.com/articles/3102/ and http://www.ahinc.com/linux101/structure.htm