Wandering through Sunday's Valassis coupons, their packet recommended a site which lists all their coupons, value, expiration dates, etc. I checked it out, and SUCH a neat feature, they have local ads, like Giant Foods, cross referenced with coupons, to actually give a spreadsheet of sale price, coupon, other specials, final price, and % savings. I LOVE IT.
There are lots of other features, some questionable things, lots of the same offers found elsewhere, like Eversave and Cool Savings. But the coupon summary/organizer/finder etc. may turn into a favorite place for me.