A very nice online article/interview/lesson in this month’s Acoustic Guitar magazine, with vids and transcriptions. If you’re curious about the classic Doylean Dropped-D ITM backup chords and fingerings, this is a solid introduction. Also includes some of his other tunings and fingerstyle, and info about his guitars and equipment.
Kudos to AG Mag for putting this up. Recommended!
http://www.acguitar.com/article/default.aspx?articleid=28068