I found this thread very interesting, lots of discussion and lots of links
They address how vax are evaluated for safety, placebo use and why "true" placebo can not be used, the FDA's role in the process, etc.
I just finished reading through it and plan on going through to look at a lot of the links presented within. I'm not suggesting it be read for the sole purpose of making up someone's decision on one thread, but as a starting point to find info.
(disclosure - the thread is from 2006-2007 and has a pretty strong anti-vax vibe)
ETA: Maybe if anyone else knows about some great old MDC threads (full of info/links), we could make a list?
Edited by slmommy - 3/2/12 at 2:06pm