I tried the coupon code online with World In Conflict (figured an extra 10% would be nice) and received the following:
Error
There are no items in your cart that qualify for the terms of the coupon entered. No discount was applied. You can review the terms of the coupon by clicking "view terms" below, or remove the coupon by clicking "remove coupon" below.
Offer good for 10% off your next video game purchase. Limit 3 games per customer. Good for one use only between now and 12/31/2008 excluding purchases between 11/27/2008 and 12/1/2008. Not valid on previous purchases. Qualifying purchases exclude Outlet items, sales tax, gift card purchases, warranty purchases, shipping fees, and delivery fees. Coupon code valid online and at 1-888-263-6003. Barcode valid in-store only. Not combinable with any Circuit City offers. Not redeemable for cash. Reproductions/photocopies will not be accepted. Void where prohibited or restricted.
After some more testing, it looks like the code only works with console and handheld games. I thought maybe the issue was that WiC was already discounted so I tried Sins of a Solar Empire, but it won't discount either. But, Zelda: Phantom Hourglass will discount.