So far (note that two predicted dates are in the past!):

WA2SI: September 13, 2003
KF6TPT: September 29, 2003
KC8EPO: December 31, 2003
K2UNK: January 1, 2004
K2ASP: March 15, 2004
AA2QA: April 1, 2004
N2EY: April 15, 2004
N3KIP: May 1, 2004
KC8PMX: July 1, 2004
K3LT: September 15, 2004
Kim: June 1, 2008

If I missed anybody, please add your guess to the list.

73 de Jim, N2EY