I've tried downloading both free and paid apps today, and get a error messages: "Authorization Failed. Please connect to iTunes." and "Cannot retrieve download information. Please connect with iTunes." I tried downloading an app from within iTunes, and also got an error message: "Could not purchase 'TwitterFon'. An unknown error has occurred. (-4). There was an error in the iTunes store. Please try again later." This has been happening for the past 30 minutes or so. This also happens if I try to update an existing app. Anyone else having issues? I've tried rebooting the iPhone, re-launching iTunes, syncing, etc...still no go.