Go here for the coupon insert preview for 2011. This list will help you know when to buy a newspaper if you are not a newspaper subscriber or when to buy an extra copy if you are a newspaper subscriber. Anouk and I both subscribe to the Chicago Tribune as their coupons are better than the Rockford Register Star. (Google or do a Swagbucks search for a coupon code for the Chicago Tribune to get a great deal on a subscription.)
Also, remember to put a vacation hold on your subscription when there are no coupons. This will get you an extra 7 weeks out of your paid newspaper subscription!
Thanks to BeCentsable for compiling the list!