OCS ( http://www.ocsinventory-ng.org/ ) for inventory and glpi ( http://glpi-project.org/?lang=en ) for management are often used in France to manage Linux desktops.

Up to 100 000 computers (windows, linuw, solaris) are managed with glpi in an administration. In US I think there is a Cheyenne educational managing 4600 computers with these tools.

OCS ( http://www.ocsinventory-ng.org/ ) for inventory and glpi ( http://glpi-project.org/?lang=en ) for management are often used in France to manage Linux desktops.