If you haven't checked out the Christ Reformed Academy Audio resources recently, here's the link. Click here
There are Author's Forum lectures from Scott Clark, Mike Horton, Danny Hyde, G. K. Beale and others.
In addition to my stuff on eschatology, there are series I've done on the Apologetics of Francis Schaeffer, and the New Perspective on Paul.
There are series from Ken Samples on Islam, Comparative Religion, Learning How to Learn, and St. Augustine.
Most of our lectures are available in both streaming and MP3 format. Best of all, everything is free!