When Mario or Luigi run across the screen in their Fire Flower costume while downloading a game in the Shop channel, press B to shoot fireballs.
Moving Wii Channels around
When you move the Wii Pointer over a Wii Channel, hold A + B to move it to the left, right, or the bottom. Note: You cannot move the channel that you are playing games on.
News Channel hints cat
Use the Wii-mote to select the cat that appears in the Photo Channel and press A + B to get hints about the News Channel.