Raquel’s post and Peter’s reponse reminded me of two services for journalists looking for a source. Help a reporter out and Profnet are places reporters can seek out people with particular knowledge.Profnet is better with academic sources.
Pros: they’re fast. You can get the query out broadly.
Cons: if your query is specific someone could steal your story. They’re run by PR people so sources require vetting (Sourcewatch provides help). These are people who want to be found by reporters, so they’re not always the best sources.