Permanently hide the dock in OS X

I hardly ever use the dock, most of the time it appears when I don't want it to (like dragging a window to the very left of the screen).

Here's the how to permanently hide it:

defaults write com.apple.dock autohide-delay -float 10; killall Dock

This actually is a hack, but it works.

Press Option-Command-D to manually show/hide the dock, that still works.