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My bad, I forget that iOS 4 is half-installable on older devices. Jailbreak and enable the missing features.
And iPhones only have portrait lock. I assume iPad has landscape lock because prior to 4.0 it had a physical orientation lock switch and customers would be even more upset with Apple if they not only took away the hardware switch but also the ability to lock in landscape. (also, if you have an ipad, jailbreak and get your hardware orientation lock switch back.)
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