On the off chance that people haven't checked it out yet, here's that "New Yorker" profile of Paul Haggis that's ultimately the biggest-yet expose on the Church of Scientology. It's LONG, but seriously worth reading through even if you do it in pieces - just fascinating, chilling, damning stuff.
What really makes it worthwhile is that it's not at all just another "ha ha alien ghosts!" dressing-down, by now we all know about Xenu and Thetans and all the nutty business of the actual dogma - this is the REAL down n' dirty stuff: Serial abuse, slave-labor, people vanishing, brainwashing, etc; and Haggis specifically comes off as a genuinely tragic figure in it.
Give it a read.