Jockey is the tool that used in Ubuntu to manage 3rd party drivers, particularly proprietary driver what i mean is something like NVIDIA or ATI Graphic Drivers. Jockey available in GUI and Text mode, you can find exact function in both of them. To list what drivers jockey thinks are available for your hardware use jockey-text --list in terminal, see following example :

jockey-text --list
if you use some Proprietary drivers software such us ATI or NVIDIA, you will get feedback something like this.
xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, Disabled, Not in use)

To do some driver update or checking some available driver update to your hardware you can use 'jockey-gtk', you can access jockey-gtk by search it on application using keywords jockey  (jockey is defaultly installed on ubuntu 11.04 and more).

Jockey-gtk search for update Drivers
Besides of using GUI, jockey-gtk also comes with update driver notification in system tray.

jockey update driver notification
it's easy right, now we don't need to worries if have find difficulty when finding some proprietary drivers software.