==Reliable .com sources== 
 Where would I go to get a reading on whether the following are reliable sources:  
 *http://emedicine.medscape.com/ 
 *http://www.webmd.com/   
 *http://www.about.com  
 *http://www.answers.com 
 there are others.  I notice that these sources are cited occasionally, but they dont seem to be particularly convincing, esp answers.com and about.com doing so is equivalent to citing Wikipedia as a source, which I understand is not acceptable.