There are a few sites around that have some good info on Viking food and cooking:

• The BBC has an interesting set of pages on Viking food in everyday life, told as a narative
• Thora Sharptooth (Carolyn Priest-Dorman) has a great list of ingredients from archeological sites and a couple more articles on food related things
• Some good, simple recipes from Trine Theut
• The Viking Answer Lady has a good summary, with some nice pictures of cooking and eating equipment