It may have taken a bit longer, but today Gearbox Software was kind enough to send along this batch of free codes for the PS3 version of Borderlands' expansion pack The Secret Armory of General Knoxx.
Just grab a code and enter it over in your PSN account. First grabbed, first served.
Alright, hop to it. They're all here in a single post. Please try to comment the code you take to make it easier for people to find the leftovers.