Berkeley: This one site, monitored by the Berkeley (California) Public Library and created by the University of California--Berkeley, is a unique collection of efficient and focused search Engines, many of which offer speedy access to advanced or expanded searching.

Political Research Online: This website, a collaborative effort of the Harvard University Library and the American Political Science Association, is a search engine for research.  PROceedings provides conference papers from the American Political Science Association Annual Meeting for one year after the conference.