For an even more comprehensive coupon source, check out Coupon Sherpa. This site has online coupons, printable coupons, grocery coupons, and mobile coupons. I like that the system allows you to filter coupons by store and by category, and also makes it easy to find the newest coupons or those expiring soon. You can sign up for a weekly newsletter, share coupons you've found, and tweet your favorite deals right from the site.
For more savings and frugal tips, visit Fishmama for Frugal Friday.