I live in China so I only trade via Internet - no physical CDs. I trade for folk artists: Tom Paxton, John Denver, John Prine, Guy Clark, Bob Gibson, Phil Ochs or anyone else. You can listen to samples of the shows I have at http://ddpro.ucoz.com (90 seconds for each show). Have a lot of concerts from John Denver and Tom Paxton that are still not added on db.etree yet. 
 Bob Gibson - Cindy Dreams of California
I don't really mind if the show is in MP3 format or is of crappy sound quality or has a lot of crowd noise, as long as I'm interested in the setlist. But I prefer better quality lossless gapless recordings with quiet crowd - who wouldn't!
 Doc & Merle Watson - Did You Hear John Hurt?
For a more detailed and more complete list of my collection, please visit my website at http://ddpro.ucoz.com. 
 Patrick Sky - Lucky Me
Specially looking for the following Tom Paxton shows: 01/??/93 WUMB Member Concert; 01/14/95 Walkabout Clearwater Coffeehouse; 07/??/02 Big Top Chautauqua. If you have any of these I can trade "10 (or even more) for 1".
 Tom Paxton & Bob Gibson - Here Comes Another "I Love Texas" Song
Specially looking for John Denver: 1973 BBC Show 3 (video or good quality audio); 1973 Sight and Sounds Concert (video or good quality audio). If you have any of these I can trade "10 (or even more) for 1".
 John Denver - Business Goes on as Usual
Specially looking for John Prine: 12/10/82 Washington; 11/03/91 WXRK Studio, New York, NY; ??/??/79 Convocation Hall, Toronto, ON; 02/14/83 Hult Center, Eugene, OR; 05/13/10 Proviso East High School, Maywood, IL (if a recording does exist...).
 John Prine - Clocks and Spoons
Specially looking for any unreleased demo tapes from "Broadside" magazines from the early 60's!
 Phil Ochs - You Can't Get Stoned Enough