After Apple decided to allow reviews for promo codes again, Promo Dispenser was rolled back to its old system, so users, who got a promo code, have to review it on the US iTunes Appstore to be able to get a new app for free.
If you want to manage your codes in a controlled environment and get reviews on the US Appstore for every single promo code of yours, check out the site promodispenser.com (aka http://iphoneapp-promocodes.com)
The site is live since 2009 and has thousands of users and hundreds of happy developers. It’s free!