Home Canning Online
Terrific magazine that gives tips, tricks, resources, and recipes for the home canner.

USDA Complete Guide to Home Canning
Database of home canning techniques and recommendations by the USDA. A must-read.

Canning and Food Safety--Botulism
Though it's no ones favorite topic, it is an issue when you are talking about canned foods---home or otherwise. Educate yourself on the subject just to be safe.

MedLine
As you learn more about the foods you preserve, you'll become more interested in their nutritional values, and how those nutrients are used by the body. This is the definitive medical database.

homecanning.com
This site is the home of Alltrista, makers of both Ball and Kerr canning products. You'll find recipes, tips, and some of those hard-to-find canning products.