General Dog Training
Karen Pryor Clicker Training (articles on training a lot of different kinds of animals)
Dr. Sophia Yin, Animal Behaviourist and Veterinarian
Dr. Ian Dunbar (huge number of articles on all kinds of things by great trainers)
Dogs and Children
Dog Gone Safe (downloadable articles and games for children too)
Books
Mungo's Books for Dog People (everything you could want and if she doesn't have it she'll get it)