Medpedia

This Medpedia project looks quite promising.

According to the creators of Medpedia:

"Editors are now collaborating on the Medpedia Project to collect the best information about health, medicine and the body and make it freely available worldwide. Only physicians and Ph.D.s in a biomedical field are allowed to make edits directly to the Article pages. However, everyone is encouraged to contribute by using the "Suggest Changes" link at the top of each Article page."