Just a note: I think we have to buy hosting from them to get a free domain with that coupon code. The thread title was misleading
Hostgator free domains Coupon code: CACTUS
All The Best!!!
I had signed up with HostGator a while back and I think the code you posted is for when you're ordering a new hosting account. It's supposed to give you a free domain I believe, which is actually a pretty nice deal