I just got a D630 and I got dual head working by installing the proprietary nvidia driver and used the Nvidia Display Settings found on the gnome System Tools to configure the dual monitor.
One problem I have is that the gnome panel seems to want to only reside on the external monitor. I haven't yet tried to hack the xorg.conf file that this utility generated. I still have some work to do get it just perfect.
$ rpm -qa|grep nvidia
akmod-nvidia-173.14.12-2.lvn9.x86_64
kmod-nvidia-173.14.12-5.lvn9.x86_64
xorg-x11-drv-nvidia-173.14.12-1.lvn9.x86_64
kmod-nvidia-2.6.26.5-45.fc9.x86_64-173.14.12-5.lvn9.x86_64
xorg-x11-drv-nvidia-libs-173.14.12-1.lvn9.x86_64