All of the Spring Conferences of GPTS dating back to 1998 have been made available online.
The full messages posted for these conferences:
1998 Southern Presbyterian
1999 Did God Create in 6 Days
2000 Written for our Instruction: The Sufficiency of Scripture for All of Life
2001 Sanctification: Growing in Grace
2002 Reformed Spirituality: Communing with our Glorious God
2003 The Worship of God
2004 The Covenant
2005 The Doctrine of the Church
2006 The Triumph of Christ: The Missionary Enterprise of the Church
2007 The Christian Worldview: Thinking God’s Thoughts
Only a sampling of messages posted for these conferences:
2008 A Reformed View of End Times
2009 John Calvin: 500Years in Retrospect
2010 The Nature and Sufficiency of Scripture