Here comes my second coupon list. Most of the domains in my old coupon list has expired.
NameCheap.com
FEBLUV
$0.88 off for .com, .net, .org, .biz, .us
Expiration: February 29, 2008
GoDaddy
goox3004at
$6.95 .com domain name registration
USA6
$5 off $30 domain name order
SAVETEN
10% off domain name order
OYH1
10% off
OYH2
$5 off a $30 purchase
OYH3
$3 off / $6.95 any .COM
chill3
$6.95 .coms
gdd1101c
10% off any order of $40 or more
Hope you’ll find it useful 
Godaddy
TAKETEN - 10% off
gdh031430 - $10 off $50.00+ orders
Candy - $5 off every $30.00
SAVE10 - 10% Off Any Order
LOL23 - $10 off of $40 purchase - expires 07/07/08
digg - Save 10%
diggnation - 10% off
gdm0105 - Save 10% on select New Year’s resolution domains!
gdbb728 - 10% off
gdm0706d - 2 .NET for $10 (40% off)
cjcfm10 - 10% off
cjcfm30 - $5 off $30 order
OYH3 - $2 off on .COM domain
gmd0606a - $6.95 .COMs
gdbb730 - 10% off new orders
gdm0627g - 2 .MOBI for $20 - 7/15/07
CATALOG1 - $20 off a $75+ order
gdbb776 - 10% off
cjcdtaker4 - $1 off any order - expires 7/31/07
cjcdtaker7 - $20 off $100 - expires 7/31/07
cjcdtaker2 - $6.95 .com domain - expires 7/31/07
cjcdtaker5 - $5 off any $30 order
NameCheap
NEWSWORTHY - $7.99 instead of $8.88 - Valid for August
Coupon Code: NEWSWORTHY
This coupon is available in August only.
With this coupon you get domains for $7.99 instad of $8.88