OATD: Open Access Theses and Dissertations you can access electronic theses and dissertations of masters and doctoral candidates from colleges, universities, and research institutions around the world. Over 1.8 million documents are available for viewing at present.
A list of recent additions appears on the homepage. You can use the search box or the advanced search option to look for specific research.
A similar resource is NDLTD: the Networked Library of Theses and Dissertations.