Safari on OSX has always had the ability for a user to set their default browser preference (to chrome for example). I wonder if iOS will ever go this route.
I find it odd that Microsoft went to court for doing the same thing in Windows but it's okay for Apple to do it.
They should do it to make users happy. I'd like to be able to more easily use apps like Sparrow and Chrome, but it's tough when they can't be set as the default.
Choice (e.g. being able to choose which browser, search engine, etc. you prefer) helps add to a positive user experience. Making users feel 'boxed-in' to using certain apps is a bit reminiscent of another large software company from years ago.
Apple will get the courts wrath soon enough. The smartphone market is still so new relativly speaking.