There are few trading blogs I track regularly. Many of the most popular are known to people, and some of them offer general commentary on market. Many blogs are just marketing tools for newsletters or other advisory services. There are number of blogs catering to day traders but few blogs by traders have long term approach.
The Instantbull ranking of Best of Breed is dubious. Many of the sites on it are just snakeoil salesmen using their blogs to sell newsletters, some of the newsletters have atrocious returns, hey but they are popular.
Here are two blogs/sites with interesting approach to market. If you go through them, both have very profitable replicable strategy for swing or long term trading.
Wishing Wealth : This one has a interesting twist on CANSLIM strategy.
DJ Interactive Markets : This one is focused on trading small caps using earning and momentum.