Gearbox Software via Twitter offers SHiFT Codes that unlock Golden Keys for use on the PlayStation 3, Xbox 360, PC, or Mac versions of Borderlands 2 for free. That's the best such deal we've seen since March, when we saw a different set of codes. The codes:

PlayStation 3: CTKJ3-JT6X9-WBK95-9JWT3-9JHJZ

Xbox 360: CTKJ3-JT6T5-THR69-5RTT3-9JH69

Windows / Mac: C3CT3-9FH6T-HCJRC-BB3TT-33TXR