Following in Kyle's and Paul's footsteps, here is a listing of concerts I've seen (that I can remember):
Susan Ashton, Anita Baker, Barenaked Ladies (3), Junior Brown, Sam Bush, Jeremy Camp, Gary Chapman, Stephen Curtis Chapman (3), Ashley Cleveland, Pat Coil (2), Robin Crow, DC Talk (2), Jag, John Denver, Dream Theater, Brian Duncan, Bella Fleck and the Flecktones (2), Amy Grant (3), Chagall Guevara, Every Mothers Nightmare, Giant, Glad, Buddy Green, Tom Hamby, Larnelle Harris, Harvest, Kim Hill, Alan Jackson, Billy Joel (4), Elton John, Wes King, Mylon Lefevre and Brokenheart (3), Bebo Norman, Geoff Moore and the Distance, Mercy Me, The Ministers (2), Rich Mullins, Nickel Creek, Sandi Patti, Pont of Grace, Sammy Cax (3), Off Kilter (2), Charlie Peacock, Petra (2) , Prince, Riders in the Sky (2), Run C & W, Rush (2), Shenandoah, Ricky Skaggs, Michael W. Smith (5+), Russ Taff (2), James Taylor (2), Steve Taylor (2?), Truth, Van Halen, Vertical Horizon, Greg X Volz and Pieces of Eight, Derek Webb, Whiteheart (6+), David Wilcox (2)
If I missed some, please post them in the comments.
UPDATES: Ray Charles (2), Chuck Mangione, Doc Severenson, Ella Fitzgerald, and Spyra Gyra.
MORE UPDATES: Kenny Rogers, Jerry Seinfeld, Bill Cosby, Louise Mandrell, Cowboy Junkies.