Great Education Search Engines You Should Try:
http://scholar.google.com/ A search engine designed to search scholarly journals .
http://education.iseek.com/iseek/home.page A non-commercial search engine that delivers editor-reviewed results from universities, government sites and other noncommercial providers.
a web search engine for students and researchers that aims to make academic information easily accessible to everyone.
NSDL--National Science Digital Library
Emphasis on the sciences, technology, engineering, and mathematics (STEM)