Here's an idea I like. Over at A Full Cup a bunch of other moms set-up a site to make grocery shopping easier and less expensive. The Shopping Lists feature has all the sale items at local grocery stores and coupons all in one place. You can click on a store and instantly find out what is on sale and find coupons to match your shopping list.
If figures that a group of moms would figure out a way to make grocery shopping easier and cheaper.
Now that you know about it, go forth and save!