Don't expect to find a link to FAIR or AIM here. Those are the big boys who make media bias an industry, whether it is Limbaugh-Loathing or Network News Nattering Nabob Naysaying. Besides, you can easily find their political machines by yourself. Some are about the bias of a specific TV show, reporter, commentator, or publication.
Some essays are about general bias by the media as a whole.
Most are very serious. Some were even written by me. They are presented in no particular order. Regardless of YOUR bias, you should find something you like here. Your recommendations of new links will be welcomed.