There's not much I can do here but I just googled puppy mills and found this very excellent site. I'm sure everyone here knows about it but I might put it in my sig anyway. There's a very good campaign called PAWS that the Human Society of America has organised. It looks very easy to get hold of your various US Representatives to take action on getting puppy mills to adhere to more stringent animal welfare laws - which they seem to be working around with loopholes at the moment
http://www.stoppuppymills.org/
Why don't they just ban puppies, kittens and other mammals from their pet stores like we do here?!