I use Envy to install the Nvidia-driver for me, and I like it from the moment I tried it.
At first you had to drop to a TTY to make it work, and work it did!
It installed for me the latest Nvidia-driver without any glitches.
Now Envy is maturing: currently it has a Gui and it not only can install Nvidia-drivers (also the legacy drivers), it can also install Ati drivers for you, handling all needed dependencies and configurations.
Alberto Milone is constantly improving his application; if you look for an easy installer for your Ati or nvidia card Go for Envy :-)
Unfortunately Envy is not supporting Feisty yet.