What the hay is BPA?

The title of this post is supposed to be funny...but in all seriousness I wanted to find out all the raucous about BPA. So far, I have avoided any toys and cookware with BPA because I have heard that it can cause adverse health effects. If any of you were wondering, here is a good informational site http://www.hhs.gov/safety/bpa/ about it. I found it to be helpful. I try not to be over the top in my sort of obsession with health (I do admit it can sometimes be an idol of sorts, and I am working on this daily) but I also want to strike a balance between being mindful of what I give to my husband and baby and what I let go....any of you feel the same struggle?