Go Big is a program launcher/start menu application. With Go Big any program can be selected quickly with just one movement of the mouse.
Go Big can be used instead of a traditional (Windows 95 inspired) start menu. I believe Go Big is more user friendly.
The bigger the target the easier it is to hit: Go Big devotes a lot more area for each selection than the traditional start menu which means the user can make a selection with a quick imprecise movement of the mouse.
A user must work a bit to find what they are looking for with a traditional start menu. The user must first select the category that the program they wish to start was classified under, usually wait a moment for the sub-menu to appear (sometimes there's a pointless fade-in effect) and then very carefully move the mouse pointer right (moving slightly up or down may change the category selection - aaargh!) and then move down to the program to start. Go Big makes effective use of a high-resolution display: All the choices are immediately visible and can be selected with just one movement of the mouse.