Lonesome Death of Hattie Carrol - I'm surprised somebody mentioned this, I thought it wasn't that popular, but it's one of my favorites. Here's a link to a pretty good version:
http://youtube.com/watch?v=5qEtyi4rcCc
Stuck Inside Of A Mobile With The Memphis Blues Again
Sad Eyed Lady of the Lowlands
There are probably like 10 others that are very close to my favorite.