Calvin Seminary hosted a conference this past September which reflected the life and teaching of Herman Bavinck, who was a contemporary of B. B. Warfield. There are 13 messages to the conference. I have not listened to any of these messages yet, as I have an iPod full of material at the moment, but I will be checking this out soon.
Unfortunately these lectures are in Real Audio Media format.
There is also an interview on file at Reformed Forum, interviewing Dr. Ron Gleason who has a biography soon to be published on Bavinck.