Coupon Sherpa is a new app that allows you to access and use coupons using your iPhone or iTouch. You can search for the coupons and the store can scan them right off of the iTouch! There are not manufacturer/grocery coupons available yet, but it looks like there are quite a few store coupons.
It would be a great app to get and then if you happen to be in a store you can look for a coupon and save some money!
You can get the app for free until Friday May 1st. After that it will be $1.99.