I have installed Nvidia driver from default repository in my just installed Ubuntu 10.10 amd64 and enabled compiz 3D effects.Install Nvidia driver in Ubuntu Maverick (10.10) is much easier than Ubuntu Lucid (10.04).
Install from the default local repository:
Open a terminal window from Applications ->Accessories menu,and run this command:
sudo apt-get install nvidia-current
then restart you computer,run the command to create the configuration file:
Log out and back in ,and you can now change nvidia settings by System – > Administration -> Nvidia X server Settings