The news in all formats is a great source of story ideas. A sampling of news resources:
Life stories are another potential source of story ideas. Some collections available at MHC:
Pictures can evoke stories. Plenty of images are freely available on the Internet, but a few of our library image databases also provide background information about the pictures they contain:
Songs often tell stories and music can evoke mood (plus sometimes it's just fun to have some background music when you're writing!). Some music sources: