back in the day Bulldog trader was the man on the message boards...looks like he's making a comeback http://bulldogtrader.blogspot.com/
Actually X is blogging again now - has been for a few months. Another favorite is Trading Goddess for the photos. I mean charts.
I might have a slight bias (facetious tone) but after looking through many of the listed blogs, I feel that the chart analysis that I post is on par with many of the best bloggers. Many of the charts that I see are simply "charts" with no substantive analysis in terms of what the market action nor any real analysis of what might be ahead. ...and those that do make next day / upcoming predictions are horrifically wrong. I'm always trying to improve my blog and would appreciate any serious constructive feedback. Good Trading! www.listentoyourchart.com
http://www.castrader.com/ No longer updated - but it references some excellent material if you have a quant lean. http://epchan.blogspot.com/ Another quant site - the author also has written a book that I found very useful. http://abnormalreturns.com/ Links daily to articles of interest across the sphere of finance, so some quant, some portfolio management, general finance, options etc. I begin each morning reading it. http://adamsoptions.blogspot.com/ If you are into options, you can learn a lot here as he comments on daily set-ups and VIX movements