This post is updated on 10/23/2015 from the original 7/10/2008 post.
I desperately need to mention how I got suspend using my nVidia card to work on my Dell D620 Latitude.
Update: The quirk causing the suspend issue was an apparently standard problem with many laptops and that variant of the Fedora/Redhat kernel. The solution was found at http://klamstwo.org/evad/archives/55. However, that link is now defunct.
A better link to referencing for fixing the suspend issue would be my article http://realsuddenlike.com/suspend-on-d630-with-fedora-9/ that actually references the same dead link above. However, I go into much greater detail in that article
The solution referenced is in fact the solution that worked multiple times for me. In fact, I referenced it in my blog to help address suspend issues for me on multiple laptops in the older Latitude series. I hope this helps readers as well.
If you have questions or comments, feel free to leave them below!