O.k. this is big! I heard it was coming, but I didn't believe it. SOME Kmarts are doubling upto $3 coupons for the week starting 1/1/8/09. They do not accept internet printables. They will only double 25 coupons per transaction and will only double the first 4 of a kind.
I am going through my coupons and will let you know what to look out for, but off the top of my head I see more free electrosol with the recent $2.50 coupon.