Linux on a Latitude D630. The journey

Following this post I was able to install the proper nvidia driver in order to get the desktop effects to work on Fedora 9.

Basically the steps are:

Step 1 - Install the Livna repository
su -
rpm -ivhU http://rpm.livna.org/livna-release-9.rpm

Step 2 - Install the Nvidia drivers
yum -y install kmod-nvidia

After this,reboot your X server.

This should be it, except that because I was using the PAE version of the kernel, I was not able to load the driver.
I you have the same issue, just edit your boot loader and try a no PAE kernel. If you have only 4G of ram like I do, it does not make a difference anyway.