When Apple removed the "Enable 3G" switch in iOS 5, the decision was universally met with confusion, even anger by those of us that used it to save battery life in areas where 3G was flaky. By removing the option to disable it, Apple caused us all a headache we could do without.
Now, with iOS 5.1, Apple has reinstated the option quietly, once again giving us iPhone owners a little control over the speed at which our handsets connect to the internet. It may not seem like much, but this little switch is a big deal to many.
It's perhaps fitting that Apple has brought a power saving feature back in a release of iOS which is meant to increase battery life in the power-hungry iPhone 4S, too...