Below is a link to one article and I forgot to ention tha the only vaccine required by law is the rabies. Obviously you would not want to avoid vaccines that might benefit your dog's health, but as this article suggests, most should be good for a lifetime or at least 7 years. Most vets have gone to a 3 year cycle for vaccines. You can also request a titer test be done if you are not sure if your dog is still protected from earlier vaccines.
This is good for rabies too.
Also, if anyone has a dog who has had an adverse reaction to the rabies vaccine, there is a way to avoid the vaccines legally in the future by having the vet write a letter on his stationery explaining the risk to the dog's health and most Animal Control departments will give a waiver.
http://www.mercola.com/2003/apr/2/dog_vaccines.htm