I have looked at the list for ios4 features and didn't see this listed. If I overlooked it then my bad. If you double tap the home button for fast app switching. Scroll all the way to the left where the music controls are. The auto rotation button is right there. Click it and no more annoying autorotation. I haven't heard this mentioned anywhere and i personally thought it was a repeat button or something for music. This was one of the main reasons I'll jailbroke my iPhone and installed norotate. Has this been mentioned anywhere before?