Gearbox Software will be celebrating Halloween today with SHiFT codes that will unlock unique character customization skins for your Borderlands 2 characters (via Joystiq). Tune into the Gearbox Twitter and/or Facebook pages starting NOW and keep your eyes out for codes.
SHiFT is a feature built into Borderlands 2 that has so far allowed Gearbox to mass-distribute codes for unlockable Golden Keys. It also monitors player data behind the scenes. The service is still in its infancy, but things like Golden Key codes and now this Halloween promotion certainly seem to demonstrate the developer's commitment to harnessing what SHiFT can do.