THE CRITICAL INVESTOR

"CaesarsReport.com is an online mining portal specialized in (junior) mining companies."

This free blog covers a large number of quality junior companies in a serious and knowledgeable way, and is sponsored by some of them. This results of course in biased blogs/reports for sponsoring companies, but I found a fair number of featured companies (sponsoring or not) actually to be of interest or even of high quality, and hardly covers trainwrecks. Blog provides for a lot of sophisticated insight, has a weekly free newsletter.