I think Chris and John Adams provide excellent critical thinking, analysis, and research. All of Chris Kendall's calls are worth listening to along with the John Adams Afternoon Commutes. I don't trust a lot of the characters that have appeared on Afternoon Commute such as Jan Irvin, Joe Atwill, Jay Dyer and the list could go on, but I do like the truth they do provide.
Another site I think is worth the time is Cluesforum.info
I would tread cautiously there. I spot fakes posting on there a lot. You have to be able to watch out for the disinformation that gets spread on there. I think Simon Shack and Hoi Polloi are genuine, but there have been times where I've thought otherwise. For now I trust them, but they do have disinformation artist on there all the time.
Finally TheClueschronicle.info is another site which produces good audios from Khammad and Hoi Polloi. I think Khammad and Hoi Polloi expose a lot of the lies we have been fed through history and culture. I trust Khammad is real and genuine, but there are some issues I have with her promoting Lenon Honor and Dr. Morse without being critical of them.