Here's a very interesting (and long) essay about Louis Armstrong and his versions of "St. James Infirmary." I accidentally bumped into this blog on my way elsewhere. I'm flattered that this gentleman, Ricky Riccardi, refers to this humble site - and excited about the information he provides. Among the treats to be found here is a radio broadcast in which you can listen to Louis talk about Don Redman, Jack Teagarden, and "St. James Infirmary."
All this is a prelude to Mr. Riccardi's upcoming (2010) book about Armstrong's later years. Sounds like it will be well worth keeping an eye open for.