Mark Driscoll's taking a page out of the "How To Be A Youth Pastor" manual and is letting the general public dictate what an upcoming sermon series will be about. (I think I poll my own students about what would be relevant to them a couple times each year.)
It's rather simple. Go here and ask your question. Then vote for your favorite questions. Then listen to Mark preach in January about the nine most popular questions (and likely their answers). Then he'll write a book about it. Neat idea. I hope he credits youth workers everywhere for this idea.
Here's a clip: