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Operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant, this database contains over 8.6 million records, including bibliographic citations and arXiv e-prints. The search interface offers advanced features, although the interface is not as user friendly as some. This a great place resource, and it is freely available to all users!
This is the premier database for articles, conference papers, patents, and more in chemistry and related areas. Coverage is from 1907 to the present. Users must create an account to log in (log in at http://scifinder.cas.org)
Search IEEE publications. Institute of Electrical and Electronics Engineers and Institution of Engineering and Technology (IET) journals and proceedings back to 1988 as well as IEEE standards are available. In addition, both Spectrum and the Proceedings of the IEEE are also available through this interface. Some journals and proceedings have been digitized back to Volume 1, Issue 1. This is an ongoing process and the date coverage may vary by title.
AIP is a not for profit agency that publishes some of the leading journals in physics. This link takes you to a page that provides the impact factors for the AIP journals as well as access to links to the journals.