If you own a RAZR HD, RAZR MAXX HD, RAZR M, or Atrix HD, and you've been waiting for the day when sweet bootloader-unlocking goodness arrives, wait no more: Dan Rosenberg has come to the rescue yet again.
Dan just published a tool that will allow you to unlock any of the above-mentioned Moto devices, assuming you have root access on your phone. Just have a working superuser app on your device, download the tool, connect to your PC with USB debugging enabled, and run the included script. From there, follow the instructions.
There are a few catches. First, you must be rooted - some 4.1.2 builds for the supported devices do not yet have a working root method.