You just bought a new MacBook Pro. You can't wait to pull it out of the box and sync it with your shiny new iPhone. Perhaps you travel abroad a lot, and you can't afford to pay AT&T's insane international roaming rates (Who can?). Or perhaps you have an application that Apple won't provide you through its App Store but that can be installed on a jailbroken phone.
If you have a new MacBook, you may be out of luck. If you have Windows, however, you should be fine. The irony is stifling.