This one is pretty obvious, but while waiting on the loading screen for the News channel, there's a cat in the Upper-Right hand corner. Click on him, and he'll give you a tip on how to use the controls! Eh, pretty obvious...
However, I've heard that if you own a Wii from UK/Austrailia and go to the Shop channel, then click on the Smily face, you'll be taken to a secret page called "The Warp Zone". It's basically a page revealing the histories of famous Nintendo franchises! I haven't seen this myself, but I have heard of it from a gaming website.
Oh, and thanks for that tip LD. That'll come in handy.