At Old Navy, you will receive $10 in Super C-A-S-H for every $20 spend (up to $50 in Super C-A-S-H) through 8/18/11.
Then from 8/25 to 8/29, you can redeem you Super C-A-S-H for items at Old Navy.
And if you really want to be crazy, go to Facebook and get a Old Navy Coupon for $5 off $25 purchase.
Fine Print: Eligible purchases include sale, regular, and clearance merchandise, but exclude gift cards, packaging, applicable taxes, and prior purchases.