A dude at Apple tech support told me that the most common iPad issue was the "mute switch" not working. The number two issue was apparently "scratches" on the screen - <a href="http://www.networkworld.com/news/2010/040710-ipad-desktop-image-looks.html" rel="nofollow">http://www.networkworld.com/news/2010/040710-ipad-desktop-im...</a>
What I can't understand is why you can't choose this in Settings if you want it as a Mute button or Orientation Lock button. Why not make this a CP setting? People who like it the way it is can go through the extra steps to activate it, while new users have it default as mute.
I first noticed that the switch changed when I was trying out the beta and was pissed until I realized there was a software button for locking. The software button is fine, though less convenient. But now there is an easy access brightness toggle too! Net positive.
I don't like it, but I understand why they can't have orientation lock be both a soft switch and a hard switch at the same time. It's a hell of a lot more convenient as a hard switch, that's for sure.
Honestly I think this change in 4.2 for the iPad makes sense. Not only for consistency sake, but I think more people will want to quickly mute audio rather than have to do it in software.
if you happen to also have the ipod nano with a camera, then the switch is priceless for watching the videos. Otherwise, you cannot make is full screen unless you physically tilt your head ... depends on how the video was taken.