Below are some places I've found with some good information for dog owners:
http://www.dogtreatrecipes.org/: Includes several recipes for home-made dog treats, which I use. Homemade dog treats are typically cheaper and healthier than store-bought treats.
http://puppytrainingguide.org/: Has several useful tips for training puppies in commands and behavior, such as potty training, leash training and biting inhibition.
www.iams.com: Has a dog article section with an abundance of information for health and behavior.
http://www.the-puppy-dog-place.com: Has a wide range of topics I have found useful in training and caring for my puppies.
http://animal.discovery.com/tv/its-me-or-dog/ and http://www.cesarsway.com/dogwhisperer/: These two T.V. Shows ('It's Me or the Dog' and 'Dog Whisperer') are extremely informative. I don't believe I have out-of-control puppies, but I still learn something new every time I watch it.