The National Library of Medicine and the NIH came up with an official guide on how to cite medical blogs in the literature. NIH gives an example that is particularly near and dear to us:
Ostrovsky, Michael; Genes, Nicholas; Odell, Timothy; Ostrovsky, Gene, editors. medGadget [blog on the Internet]. El Granada (CA): Medgadget LLC. [2004 Dec] – [cited 2007 May 16]. Available from: http://www.medgadget.com/.