Cellfire is an interesting service that provides coupons right on your cellphone for several popular locations including Hollywood Video, Subway, and Dominos Pizza. While the existing deals are limited, they have been adding new partners regularly.
After signing up you access the site from your phone or from their Cellfire application. During the registration you must give them your zipcode, which allows them to show you only deals for locations nearby. When you want to find a coupon you simply pick which coupon or deal you want, then confirm you want to use it. Each offer can only be used a limited number of times. After you confirm you will see a special code that you just show to the employee. You can see a demo of it here.
Mobile coupons certainly sound more useful, since most people will always have their phone with them. Unfortunately the deals with Cellfire are kind of limited, but as more partners realize the potential more locations will be added.
[via Webware]