dib8rman is correct.
I'll breakdown the numbers.
480 = The total number of horizontal lines of resolution displayed on screen.
p = Progressive scan. Means the TV itself will draw all 480 lines at once every frame instead of all odd frames and then even frames (interlaced).
30 = The frame rate rendered by the Wii itself. It will draw and submit the images 30 times per second.
The rEVOLution is not being televised







