Gearbox just posted these keys in their blog for St. Patty's day.

PC / Mac Zaford Gear SHiFT Code: KTCBJ-C9RTC-BSFTJ-33TT3-FBWHF
Xbox 360 Zaford Gear SHiFT Code: KJCJ3-RCWC6-5K9BF-WFBT3-3WFKK
PlayStation 3 Zaford Gear SHiFT Code: CTK3B-99K3J-XXKW3-ZTWTJ-HJH5J


Link to their blog post:
http://www.gearboxsoftware.com/community/articles/1014/borderlan...

Additional Codes

This is for one Golden Key

PS3 - K3C3J-6ZHC3-W5CKT-STW3T-JSKWH

PC/MAC - 53WJJ-THTXW-HWRTJ-3TJBT-53R6S

X360 - CJC3J-659X6-3T9TX-WRJTB-BWK9J