See, I told you so...
I wouldn't like to say I told you so, but here's another reason why was telling you shouldn't unlock your iphone: to update the iPhone to firmware version 1.1.1 you'll need to reactivate the iPhone with an original AT&T SIM card.
Basically, this means for all those who were so eager to unlock the iPhone and did so by cancelling their subscription with AT&T and using the AnySIM unlocking software, now have the most beautiful brick in the market.
But hope is not lost, I bet the iPhoneSIMFree guys will find a solution for that update as well, so you can use your brick to phone home real soon.