Sources online: a directory of experts and spokepersons
ShareThisSources offers a Canadian site that provides a list of expert contacts and media relations people. It's a "service for reporters, writers, editors and researchers." There is a separate category for news sources, as well as an event calendar. For information and names in politics and government you can look in the Parliamentary Names & Numbers, and for the media there is a Media Names & Numbers section. The site also has a search engine for its directory, where you can choose to search in the name or the subject index, or you can browse the index of topics or the list of organizations.