A little warning for those people just installing or upgrading to the latest version of dropline gnome: Because the change from XFree86 to xOrg is now complete, some issues with missing xkb configurations may occur (I just had this on my parents computer). Some fixes are presented here : http://www.dropline.net/forums/viewtopic.php?t=2452
It boils down to this:
In the keyboard section of xorg.conf change
Option "XkbRules" "xfree86"
Option "XkbRules" "xorg"
(this fixed it for me).
Uninstalling and reinstalling the xorg-package has also been known to help.
Later versions of dropline will have a fix for this.