I really REALLY want to see this movie, I can't even express my excitement (it combines two of my favorite things - home invasion and "documentary"). I thought that IMDB had listed a release date of early 2008 in select theaters, though IMDB appears to be down right now, so I cannot confirm. According to Netflix, DVD release date is unknown.
http://www.netflix.com/Movie/The_Pou...1090601217_0_0
Per Wikipedia:
The film was originally screened at the Tribeca Film Festival on April 27, 2007[3][4] The Poughkeepsie Tapes film was expected to release February 8,2008 but Bloody DIsgusting reported that it was delayed. As of yet the film has no official release date. The film has been rated R by the MPAA for "sadistic horror violence/gore, disturbing images, and descriptions."
http://en.wikipedia.org/wiki/The_Poughkeepsie_Tapes
There's a few external links there that might be helpful.