Due to popular demand here are more SHIFT codes for Borderlands 2:

These Shift Codes were released 1/14/2013

PC/Mac: C3W3B-6B95C-SWFJJ-B3BJJ-5C6XJ
Xbox: CB53J-FZFSC-9Z6JF-WRBTB-B5S5S
PS3: 5TCJB-35RWB-WCWCJ-93C3J-3SSHR

For previous Golden Keys you missed the Wiki is a good source:

http://orcz.com/Borderlands_2:_Golden_Key