A search-able website listing many millions of Master and Ph.D theses from around the world has been established by a university in Switzerland. This website is called Scientific Commons and its address is:
Scientific Commons is a project owned by the University of St. Gallen with repositories located in universities in 50 countries (871 repositories as of today). It uses Open Access Protocol for Metadata Harvesting to retrieve the theses. The ScientificCommons website basically indexes the theses and the authors only and it provides a link directly to related repository for anyone who wants to download the files.
The project is aimed to provide freely accessible scientific knowledge to the world through internet connection, which is a noble idea that has to be supported by all of us.