Nub vs. Trackball
I have been receiving a horde of emails tonight about my use of the word nub when describing the Sidekick 3 navigation system. Allow me to explain: To those of you who were fortunate enough to play video games in the 1980's, you might have played games like Missile Command or Marble Madness (pictured at left) or even Centipede. If you are younger, maybe you have seen the golf game Golden Tee? Well each of those games has a trackball, which is a ball that moves with a socket. It rolls in any direction and spins freely within that socket. The Sidekick 3 nub is like this but on a smaller scale, though it feels like it only imitates this functionality which is why I called it a navigation knob in my review from early April. It feels much like the mouse-knob that sits in the middle of many laptop keyboards, except you don't really "push it" directionally, it responds to you sliding your finger over it with a slippery sensitivity. Some people will like it, some won't. It will definitely open up some possiblities for gaming though and it will allow for more PC-like navigation longer term on the web browser. It's different, it acts in a unique way. That is why I call it a nub or a navi-knob.
Wikipedia on "Trackball" http://en.wikipedia.org/wiki/Trackball