Interesting paper - Find security bugs before they release because of the high cost to fix later. Internet Apps change some of the cost dynamics however the that does not mean fixing early is less important because its hard to fix your reputation.
http://www.stickyminds.com/Files/Automated%20Testing%20With%20Commerical%20Fuzzing%20Tools.pdf
http://www.stickyminds.com/Files/Automated%20Testing%20With%20Commerical%20Fuzzing%20Tools.pdf