Some months ago, I started with great trepidation into open waters - open G tuning -- and el Maestro Rick Fielding threw a Hawaiian tuning at me, and then we hit open-D, and one morning I happened to run across the Joni Mitchell tuning for her classic song Amelia (open-D tuned down a couple of frets to C). I note that we have had one small thread on DADGAD (the invented Celtic tuning). A couple of questions:

1) I suppose most people know that Joni Mitchell uses weird tunings, but it interests me that there are obviously a lot of famous songs that are in different tunings, which you can't find out about from the sheet music, because it is all standard! It is only when you do an open tuning that the sound of a familiar song hits you -- oh that is how they did that. Anyone got any familiar songs in some far out tuning that the citizens (me) don't know about?
2) Something standard that sounds really interesting in a different tuning.
3) Any tricks of the tuning trade you would like to share with novices?

yours, Peter T.