Cellfire (cellfire.com), Shortcuts (shortcuts.com) & Kroger (kroger.com) - ecoupon service where you can load ecoupons on to your shoppers card (i.e. Kroger, CVS) These coupons automatically come off when you buy the item and do not double.
(Manufacturers do not advocate the use of both manufacturer's coupons and an ecoupon on one item. Right now there is no way of selecting to use one or the other. The registers currently do not prevent you from redeeming 1 ecoupon and 1 paper manufacturer's coupon on one item.)
Upromise (upromise.com) - similar to Cellfire, Shortcuts and P&G. You load the ecoupons onto your shoppers card, but instead of the savings coming off your total it is deposited into your Upromise account.