Google Book Search(http://books.google.com)
Allows you to search full-text across a book. Results will provide you with a limited preview of the searched words in context as well as some additional pages in the book
Google Scholar (http://scholar.google.com)
Google has targeted its search engine to retrieve scholarly works from peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations
Use their advanced search tips(http://http://scholar.google.com/intl/en/scholar/refinesearch.html)
Scirus(http://www.scirus.com)
Elsevier has created a "science-only" search engine to filter out non-relevant content.
Science.gov (http://www.science.gov/)
Science.gov searches over 1,800 scientific and technical government web sites
from twelve different federal agencies. The site allows you to set up alerts,
search within results, email results, and sort results by author, date, and
title.
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