The Backyard Planter - http://www.backyardplanter.com/
Information about backyard organic vegetable gardening using the square foot method. Includes articles and garden plans.
Tim's Square Foot Gardening - http://timssquarefootgarden.com/
Information and tips for square foot gardening. Includes planting calendar and plant list, garden layouts, articles, blog and online store.
Vermiculite.com - http://www.vermiculite.com/
Resources and information about vermiculite for homeowners and hobbyists. Includes distributor and supplier index.