It was only a matter of time, really. A few hours ago
HaRRO, a member of the members (Daeken, Darkmen, guest184, gray, iZsh, pytey, roxfan, Sam, uns, Zappaz, and Zfhad) of the iPhone Dev Team have released an open source and FREE tool which allows you to set your iPhone free from the AT&T lock! Although the process is not yet as easy and automated as the commercial tool from iPhoneSimFree, well, it is free, as in beer! You can find it here.
I guess the guys at iPhoneSimFree and especially some of the their resellers might regret all of the delays that they had before releasing their tool to the market! The days over overpriced unlocking tools are over!
Well, my iPhone is unlocked since some time now (using the TurboSIM method) but anyway: Good for all the other people out there, especially over here in Europe!