The National Center for Home Food Preservation offers a blog, videos, a webinar, and USDA information on canning, freezing and drying foods. There is also a book, So Easy to Preserve, available for purchase.
Ball has recipes, preserving guides, equipment, and canning supplies.
Utah State University position statement on steam canners
USDA approval for steam canners with links to instructions on how to use one safely
Pressure canner comparison chart for several brands of canners
Cooking and Canning Company for canners and canner parts
Mending Shed for canners, canning equipment, and parts
VKP Brands for canners, canning and preserving equipment, and parts
Color Changes in Home Canned Food (when it’s okay and when it’s not)
Master List of Typical pH and Acid Content of Fruits and Vegetables for Home Canning and Preserving
Safety of Canning Quick Breads (Don’t)
Frequently Asked Canning Questions