If you go to http://www.couponmom.com/index.php?cid=10
, you can see what coupons are currently in the paper (or will come out tomorrow in this case). I use Florida because my State isn't listed. Not all the coupons are in our paper, but most are. They list them by Smart Source (S), Valassis (V) and Proctor and Gamble (PG).
You can also type up a product in the search and it will tell you what coupons are out and not expired. I no longer cut out my coupons and file them. I just put the date across the first section, and then when I see something on sale, I check and see if there is a current coupon. For example, last week, Walgreens had French Fried Onions on sale, I checked the website, saw that there was a current coupon available and saved 50 cents.