Here is the latest list of Godaddy.com promo codes / coupon list:

cjcPRIVATE Get FREE Private Registration when you register or transfer one or more domains. (exp 6/14/10)
(No Qty limit, Private Registration MUST be added to cart before checkout, in order to qualify for this offer.)

cjc689FAT $6.89 .coms (exp 6/30/10)

cjc749fat – $7.49 .COMs (exp 6/30/10)

cjcfat30 – $5 Off w/ $30 Purchase (exp 6/30/10)

cjcfat50 – $10 Off w/ $50 Purchase (exp 6/30/10)

cjcfat75 – 15% Off w/ $75 Purchase (exp 6/30/10)

cjcfat10 – 10% off any purchase (exp 6/30/10)

cjcfat20h – 20% off Shared Hosting (exp 6/30/10)

OYH10 – $2.50 off / $7.49 any .COM (renewals too… just used it)

BTPS101 – 20% any order of $50 or more

BTPS111 – 10% off anything

BTPS255 – 25% off $100 or more

OYH8 – 10% off whatever

OYH9 – $5 off a $30 purchase

OYH20H1 – 20% off hosting

chill8 – 10% off

chill9 – $5 off $30

chill10 – $7.49 .coms

hash8 – 10% off

hash9 – $5 off $30

hash10 – $7.49 .com registration

gdd1101c – 10% off any order of $40 or more

IAPtdom1 – $7.49 Domains

IAPth1 – 20% off Hosting