Steve Chapman, a self-confessed J.J. Cale maniac, has created a wonderful fan site at http://web.missouri.edu/~sdcd2b/jjcale.html, featuring the largest collection of J.J. Cale tablature available anywhere, including a transcription of "Drifter's Wife." So if you want to learn the picking, here's all you need. You might also want to check out the official homepage at http://www.jjcale.com.