I just found a blog by Agustín Pérez called Mule Walk & Jazz Talk that posts a lot of old source material about my favorite periods in jazz (it's a great URL too). For instance, check out this 1943 New York Times interview with Fats Waller--Fats offers some frank opinions on the state of jazz at the time. And in an interview cited in another post, Leonard Feather addresses some of the same topics.
I've added Mule Walk & Jazz Talk to the blog roll on my side bar. Check it out!
(Hat-tip to Falty on SwingDJs.com for the link.)