I thought it would be good for us to have a place where we can share the little tips, tricks, shortcuts, what-have-you that we've learned while exploring our Wii U's (that sounds kinda dirty).
My first one: have a problem with overscanning in the Miiverse? In other words, does the Miiverse screen not fit on your TV? I was having the edges cut off on mine. You can resize the Miiverse screen by going to Miiverse -> User Menu -> Miiverse Settings -> Screen Size.
I thought I had discovered another one by looking at the Gamepad and DSi plugs, but alas. They're the same shape but slightly different sizes.