Here's the newest valid Go Daddy codes. I just used OK9 to purchase some .com domains and it worked awesome.

OK7 - 10% off any item
OK8 - 20% off all orders of $50 and up
OK9 - $7.49 Domain Registration and Renewals

**Special Godaddy Code Expires on 08.31.09.
Go Daddy Promo Code OK25 25% Off Hosting or any order of $91 or more.