I don't really want to go into much of a discussion about the pros/cons of vaccination as it's already been really done to death and I'm certainly not qualified enough! However, I've just found this really interesting site written by a pathologist who debunks several anti-immunisation sites and passionately believes the sites in question are using very poor science.
I know immunisation is something we all fret about when it comes around, and any more information we can find can be useful, so I thought I'd post the link for those interested.
To be more balanced I'm sure others can come up with some better researched anti-immunisation sites to add to this thread (which I'm interested in reading too).
The Anti-Immunisation Activists: A Pattern of Deception