If you're an international customer (not in the United States), then you won't have to do much to get your hands on an unlocked iPhone 4. They come like that across the pond. So, as is usual 'round these parts, devs had to crack down on their social lives to get the new iPhone, running iOS4, unlocked. It involved rewriting the entire ultrasn0w software, which meant previous versions couldn't be used, thanks to the new baseband that Apple installed in the iPhone 4. But, PlanetBeing and MuscleNerd of the iPhone Dev Team have managed to get an iPhone 4, running iOS4, unlocked.
Thanks to a tweet from PB, he now has a soft-unlocked iPhone 4 up in Canada (which means it's probably the only one up there in that state, if they were doing their testing on only one device). And, while text from one of the devs is good enough for us, we know that pictures speak louder than words, so those are included too. One of which shows the application Cydia open and running. So, at this point, the iPhone 4 has been successfully unlocked, thanks to outside means. Of course, that could change with a future update from Apple, and then the whole back-and-forth will continue into its legendary history.
[via Redmond Pie; thanks Brad!]