While you can always hide the Dock without Dock Gone, it will reappear whenever you mouse over the edge of the screen, blocking whatever is below the cursor. And you can be sure it will happen at the worst possible time. Dock Gone prevents this by moving the Dock completely out of your way, effectively turning it off until you ask for it back.
More than one way to turn off a Dock: Dock Gone gives you several ways to turn the Dock off.
Dock Gone is the Leopard-compatible way to keep the Dock out of your way until you specifically ask for it. Press its hot key, and the Dock will disappear. Try all you want, you cannot get the Dock to appear when Dock Gone is active. Press the hot key again, and the Dock reappears in exactly the same place and with the same settings as you had before.
No more Terminal commands. No more Dock appearing when you're scrolling through a long document. No more losing your old Dock settings.
Dock Gone will become your constant companion, and you'll come to expect the Dock to always behave as it does when you have Dock Gone installed, no matter what Mac you're using.