Here's a complicated but well documented method for taking an iPhone from a unlocked state to a factory fresh state, so you can go on and upgrade to 1.1.1 if you've been testing unlocks. It works by refreshing the baseband firmware to factory default; meanwhile, bricking is supposedly caused by the altered unlocked basebands being only partially overwritten 1.1.1, causing a stew of code. *shrugs*. I haven't tried this fix yet, so I can't recommend it one way or another. But if your iPhone is already stuck at the activation screen (what people have been calling bricked), you might as well give it a whirl. What else could go wrong? *ducks*. [Googlecode]
Reverse an Unlocked iPhone to its Virginal State
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This according to Marvel Studios president Kevin Feige.
Very little is known about what the hell is going to happen in the fourth phase of the Marvel Cinematic Universe, but now we have a tiny clue.