Scientific Literature Search

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http://www.ncbi.nlm.nih.gov/pubmed/

PubMed home

PubMed comprises more than 21 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
is the most comprehensive scientific research tool on the web. With over 440 million scientific items indexed at last count, it allows researchers to search for not only journal content but also scientists' homepages, courseware, pre-print server material, patents and institutional repository and website information.

Scirus - for scientific information

http://www.scirus.com/