When you want to get your nVidia graphics card working or similar tasks with restricted drivers, people on forums might refer you to the restricted-manager. In case you wonder why you can't find it, can't install it via apt-get etc, the answer is simple: it has been renamed to jockey.
From the Applications Menu it is accessible in System > Adminsitration > Restricted Drivers / Hardware Drivers.
On German systems:
System > Systemverwaltung > Hardware-Treiber (prior to 10.10)
System > Systemverwaltung > Zusätzliche Treiber.