Here is a blog post containing six minutes of audio of John Piper discussing the controversy between John MacArthur and Mark Driscoll. Very interesting indeed.
If you want a more complete narrative of the fuss, Jonathan Christman has a nine part run down focusing on Phil Johnson and Mark Driscoll including Phil Johnson’s letter to Mark and Mark’s video response. Again, very interesting indeed.
Here is a page with all of the links to Jonathan’s posts about the matter. I found parts VII, VIII and IX to be the most interesting.