You can also find his teachings on mp3 and DVD from: http://www.digitalministries.us/page8.html
What I didn't realize is that if you go to the digitalministries website and got to the DVD Videos link you can download (if you have a high-speed connection) Steve Gregg's teaching the book of Ruth. You can either watch it on your computer or burn it to a DVD. I thought all of them were by request only but Ruth can be downloaded. This was Steve in his long(er) hair days.

There are also a few newer excerpts of him on youtube:
http://www.youtube.com/watch?v=mhPjqCmPALU
http://www.youtube.com/watch?v=PQw9Y56n0gk