Conference Proceedings are the published record of a conference, meeting or workshop by a society or association. They usually include abstracts and copies of papers and talks given at the event. This is vitally important as these events usually involve cutting edge, up to minute research that wouldn't be seen in journal articles till months afterwards.
Provides a database for searching for past conferences and their websites which are likely to have the conference papers and proceedings.
Proquest allows you limit the search to various types of grey literature including dissertations and conference proceedings.