Google Alerts – Story scout Latif Nasser tells of how he selects phrases such as “the human equivalent of” and “bizarre but beautiful” and sets google alerts for them so that he is notified whenever someone has published/used these words online
Wikipedia – Using the random article feature on the site, the producers would land on interesting people/places and try and find a story from there.
Worldcat.org – an online library catalogue that not only tells you which of your local libraries stocks a particular book, but is also home to some very special books on their sister site Archive Grid
Talking to strangers – everyone has a story, you just need to ask
Trade magazines – useful for finding stories about a particular topic