Windows Live Academic is now in beta and indexing content related to computer science, physics, electrical engineering, and related subject areas.
Academic search enables you to search for peer reviewed journal articles contained in journal publisher portals and on the web in locations like citeseer.
Academic search works with libraries and institutions to search and provide access to subscription content for their members. Access restricted resources include subscription services or premium peer-reviewed journals. You may be able to access restricted content through your library or institution.
See a list of indexed journals and sources. Academic search has implemented the Open Archives Initiative (OAI) protocol for indexing OAI-compliant repositories. They will add journals from various subjects in phases, based on the needs of users. Also see Google Scholar that helps you identify the most relevant research across the world of scholarly research.