I just had the amazing privilege of spending the past four days in Vail, Colorado with Mark Driscoll and the other Acts 29 planters at the organization's annual retreat.  I will write a recap of that soon, but I just ran across this link.  Piper has invited Driscoll to speak at the upcoming Desiring God National Conference.  Mark, who has been criticized for the use of strong language in and out of the pulpit, has been invited by Piper to address exactly that issue.  Watch this video.