If you have two macs, the best thing is to only update one of the SDKs. As someone said, you'll be stuck with the simulator, but at least you'll be able to compile 2.2.1 apps.
So wait, if you have music and apps on your phone, are you better off restoring through iTunes or through the organizer?
So wait, if you have music and apps on your phone, are you better off restoring through iTunes or through the organizer?