Here's an interesting article called "The 8 Worst Places to Steal a Movie Idea" by Michael Swaim of Cracked.com. I found it funny because almost all of Hollywood films nowadays come from these sources. That's not to say that some of the movies Swaim mentions are bad, but they rather succeeded at adapting the source material.
Check the whole 2 page article at:
http://www.cracked.com/article_15087_8-worst-places-steal-movie-idea.html
