iPhone 3GS (3.1.2 / modem 05.11.07) jailbroken...

...via http://www.blackra1n.com/.

That was the smoothest, easiest jailbreak ever.

Now to install Cydia, and (black-?) sn0w to unlock.

Oh. Hell, sn0w unlocked my iPhone before I could finish posting.

GeoHot, you are awesome.