The NYTimes has a nice implementation of a crowdsourced app to try and predict which television shows will get cancelled this season. It reminds me of something Brent Stinski of MediaPredict told me once, that if a show makes it past 5 episodes, it will usually survive but if it's going to get cancelled, it's going to happen before the 5th episode.
Judging from the results so far, his theory seems pretty accurate. Check it out:
http://www.nytimes.com/interactive/arts/television/2011-fall-tv-cancellations.html
