My first son was vaccinated, he had bad reactions and suffered permanent damage. This started me on my path of "enlightenment" so to say, and I devoured every bit of information that I could, on both sides, of the vaccination debate. After carefully evaluating what I had read (and meeting a mom whose son went downhill after the MMR), I decided that vaccines were not in the best interest of my children. My first son was sick quite a bit as an infant and toddler, my second son, who has never had a vaccine, is hardly ever sick.
If you are seriously considering not vaccinating, I highly recommend doing your "homework". As previously mentioned, I looked at both sides. I read the vaccine reaction reports in the government maintained VAERS, I researched the diseases and their risks of death versus the risks of the vaccines, I spoke with older people who had been around before the creation of some vaccines and asked them about what it was like (my grandmother said, "For crying out loud, it is just measles, all five of my kids had them!")
I also suggest that you find a doctor who is supportive of your decision, or you will be in for an argument everytime you take your son in. If you contact http://www.momvaccines.org/, they may be able to help with the location of a supportive doctor, they also have other resources such as the exemption form for school or daycare, should you decide not to vaccinate before then.
There is also an online group: ____@____.com, which has some great information. Some of what comes through there is a little radical and you have to sift through some of it, but I have learned quite a bit from them.
This is a very big decision to make and I applaud any parent who questions the status quo and tries to make an informed decision for their children, whatever that decision may be. If you want more information, feel free to contact me.