M. William Phelps is popular. Through Crime Rant, he is also putting out ebook versions of some articles, books, etc. (by himself and other true crime authors):
http://www.crimerant.com/
Some true crime writers (and law enforcement professionals) have launched Woman in Crime, and there are links to some author sites:
http://womenincrimeink.blogspot.com/
Check out the True Crime Book Reviews blog for in-depth reviews and recommendations:
http://truecrimebookreviews.com/
I'm not sure if the author is still updating the site. However, the author also launched True Crime Zine:
http://truecrimezine.com/