Search Engines (special)

www.business.com
The business search engine, contains over 400,000 listings of quality web sites cataloged into approximately 25,000 categories
www.findlaw.com
Law search engine
Google Scholar
Google Scholar enables you to search specifically for scholarly literature, including peer-reviewed papers, theses, books, preprints, abstracts and technical reports from all broad areas of research.
NCBI (Entrez) search engine
The life sciences search engine; searches PubMed and all NCBI databases from one interface
Omnimedical search
A metasearch engine for the medical search engines, including PubMed, MedlinePlus, NCI, and more.
www.scirus.com
A science search engine from Elsevier Science. Searches both free and fee-based content.
academic.live.com
An alternative to Google Scholar, this engine's focus in on computer science and physics