You are in the tips section.

Disable Dashboard

There are a variety of ways to pull the rug out from under Dashboard. But, really, why would you want to1?

Via The Command Line

Disable Dashboard from the Terminal:

defaults write com.apple.dashboard mcx-disabled -boolean YES

And to turn it back on:

defaults write com.apple.dashboard mcx-disabled -boolean NO

After either command you must restart the dock:

killall Dock

Credit goes to this Mac OS X Hints post

With a Program

DashOnOff
Disable & Enable Dashboard Utilities

With a Widget

There’s actually a widget that will disable Dashboard as well, if that’s how you want to go.

DisableDashboard Widget

1 Remember that if you do disable dashboard, you probably should re-enable it before installing any system updates, since it will probably expect it to be on.