I read The Helpful Stranger and Secrets.
Two good sources for mystery podcasts are The Podcast Page at Alfred Hitchcock's Mystery Magazine and The Ellery Queen site, where a professional podcast of my EQMM story,The Star of the Silver Screen.
SleuthSayers blogs on mystery fiction by a lot of the old Criminal Brief gang and lots of talented new writers. I show up occasionally
Mystery Writers of America
Sisters in Crime
International Association of Crime Writers