This originally started as a test post, when I was trying to figure out a slick way to embed audio files in a WordPress post, with nice inline play controls. Sound Manager 2 is a great Flash/HTML5 hybrid audio player that just "does the right thing" depending on the visitor's browser, and offers lots of widgets for hosting audio files, so I settled on this as my player. I realized that others were also trying to figure out how to do this, so I'm cleaning up this post and leaving it up as a tutorial.
So, game on, here are the four widgets:
The 360 player
The inline player
The page player
The button player[mp3] Knockin' on Heaven's Door