I got this list of tips from Bankrate. Bankrate has some really good savings information on their site and I go there frequently.
Trim your food bill by as much as 19 percent simply by shopping at a couple of different stores.
Don’t “crisis cook.” Shopping after work for the day’s dinner gets expensive. Plan a weekly menu before shopping and watch your grocery bill shrink.
Don’t waste money on prepared foods. Instead, prepare meals ahead of time and freeze them, or double a recipe when cooking, and freeze the second for a …

Savings Tools and Information:

Seasonal Food Calendar
Grocery Store Sales Calendar
The Food Keeper
USDA Food Plans: Cost of Food
32 ways to save when grocery shopping
20 ways to save on groceries

Watch:

Supermarket Secrets – Dispatches part 1
Supermarket Secrets – Dispatches part 2

Save Money Using Coupons:

Coupons.com – wide variety of up to the minute coupons, think of it as the Sunday paper coupon section.
Coupon Mom – online coupon codes, printout coupons and free samples, etc.
Coupon Cabin – updates deals three times a day. “most-used coupons” and “favorite deals” sections. Weekly email newsletter alerts.
Coupon Surfer – offers …