I'm probably the only person who can't "touch-calculate" on the number pad to save their life, but still loves the thing for its big honkin' enter key. When I'm using a GUI application and a dialog box pops up, I can smash that sucker with the left side of my hand to close it way faster than I can click on the "OK" button or move my right hand to the traditional enter key. Tapping enter with my thumb on a laptop keyboard just isn't the same.