ResearchGate a large professional network for scientists and researchers with more than 1.3million members. With access to over 45million abstracts (not full text!), Researchers can search through 7 of the largest databases and millions of smaller ones simultaneously, including PubMED, Cornwell University and CiteSeer; by using their literature search. They also have a science and research specific job board
Harzing – Anne-Wil Harzing, Professor of International Management at the University of Melbourne, Australia. Includes information and resources in her research areas, and on journal quality.