There is an excellent essay on Patricia Barber's blog, Head Upon a Stone, entitled Will the Real Quakers Stand Up? Not All at Once Please.

Excerpt: "If George Fox came back today, I doubt he would recognize any of us as Quakers. It would be very odd if he did because the genius of what he and the seekers of the 17th century discovered was that humanity's search for God is not something carved in stone, unchangeable and frozen in time."