"Jonestown: The Life and Death of Peoples Temple" airs tonight on PBS!
It's a really good documentary, all told by the participants (i.e. no narrator, just lots of interviewees telling the story). And it's horrifying and fascinating and a shame and a trip.
The website is pretty good, too. (Okay, I wrote some of it, but what got me was all the excellent extra interviews and media they have on there.)