The new restrictions feature in IOS 4.2 makes it easier to manage Apple mobile devices in the classroom by keeping students from installing and deleting apps. With the restrictions in IOS 4.2, you also have full control over the types of content students can access.
The rotor gesture supported by VoiceOver provides a quick way to adjust the speaking rate and change the language without having to go back to the Settings app each time a change is needed.
The web rotor is a special VoiceOver gesture for quickly navigating a web page in Mobile Safari using lists of headings, links, form controls and other structural elements. For the web rotor to work well, the author of the web page has to properly structure the web page with headings and other structural elements when it is authored.