There has been alot of threads about health and the blood issue. I can't stress enough the importance of having an Advanced Directive or Living Will. Especially if your family are still JW's.
This site allows you to pick your state, then fill in your name and address. Print it, then fill it out according to your wishes.
http://www.legaldocs.com/htmdocs/livin_st.htm
This site registers Living Wills, that all hospitals and doctors can access. I haven't been completely thru it yet. It also gives alot of info.