Read The 'Net: A Tangled Web of Health Information on Yahoo! Health. Some good but incredibly basic information about information on the web. (Woah. Meta.) "Lot's of junk on the web." Yep. "School, government and non-profit sites are probably more trustworthy." Uh-huh. "Your doctor should be the final judge on health info." Totally. And at the bottom, if you want to know more about using health web sites in general, there's a link to the US National Library of Medicine. A library? Libaries know about information too? Wow. Who knew? Perhaps your local librarian might know about good information sources, online or off, as well. No. It's better to go to your doctor (or your local "president and CEO of the American Institute for Preventive Medicine") for to learn about the nature of the info-universe out there. They're the experts on looking up stuff, right? And they've got plenty of extra time to sit chatting about the bias and trustworthiness of online publications and portals. No appointments necessary. Just walk in and ask the librarian at the reference desk, er, I mean the doctor at his/her doctorin' table and ask them. Good luck and say hi for me!
(Allergy alert: May contain sarcasm.)