If you've ever worked on a laptop computer with a touchpad it is inevitable that you will mistakenly touch the touchpad while typing, causing the mouse to jump or cursor to move and interrupt your typing.
Download and install Touchpad Blocker,
a fantastic free utility that can run in the background and detect and block any time you mistakenly touch the touchpad (or your computer thinks you have.) As can be seen in the picture to the right, this utility can be customized to help make sure it only blocks the real mistakes and can be turned on and off with a shortcut key.