These are a couple of sites that would be good references for everyone. Health and medical information sites. I haven't used them too much yet, knock on wood.
1.
KidsHealth - also has a teens page and a parents page.
2.
MedlinePlus - a government website with a lot of information about medical terminology and drug information
3.
PDRHealth - tons of information on everything health and medical related
5.
OR - Live - interesting site to watch surgeries, without all the drama of a tv show