“iUnlock, the first free, open source iPhone SIM unlock app, was released to the underground just 74 days after the iPhone’s release. Developed by the iPhone Dev Team, it’s not (yet) for the faint of heart and it takes a little longer to do its magic than iPhoneSIMfree’s method, but it works.”
Article – The stuff you’re looking for (tuts, mirrors, etc.) (Shaun Inman followed the tutorial over at freeiphoneunlock.com)