Another good resource is www.nvic.org
Much of the research about safety and efficacy of vaccines is actually pretty bogus. I have met Dr. Tenpenny, she is great too, good resource. I implore you to research both sides voraciously. I am a chiropractor, been researching and practicing natural health for 20 years. I believe strongly, not on emotion, but on science, that the vaccination decision is the most important in your kids life. My kids are not vaccinated, I have hundreds of families as patients over the years, not vaccinated, and dozens of chiropractor friends whose kids are not vaccinated, all are fine. The 'fear mongering' of outbreaks is exactly that, fear mongering, not based in science. just my 2 cents.