I installed Bumblebee to solve Nvidia/Intel driver problem. It does work well, but it also disabled Unity 3D.
How can I get my Unity 3D back?
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Bumblebee is pretty unstable right now, especially in 12.04.
Nvidia drivers a pretty solid, even if they aren't open sourced. I recommend sticking to the official driver. I installed Bumblebee on a 9800GT and it took out my whole xserver.
sudo apt-get autoremove --purge bumblebee bumblebee-nvidia nvidia-current
and download the official driver from nvidia: http://www.nvidia.com/Download/index.aspx?lang=en-us