Digital Information Sources

Databases Covering All Fields of Science and Engineering
New Library Catalog (EDS)
Springer Books & Journals
Elsevier Physical Science and Engineering Journals (Science Direct) 
Wiley Books and Journals 
IEEE Database
ACM Digital Library
O'Reilly Catalog
MathSciNet
Open University 
Art and Architecture Source
www.jove.com
FreeFullPDF
Google Patents
Google Scholar
Google Books
ISO Standards 
Schaum's Outline Series 
Mathematical Handbook of Formulas and Tables

Databases Covering Selected Fields
CiteSeerX, Computer and Information Science
ArXiv Applied Mathematics
US Dept. of Energy
Education - Eric
Nuclear information IAEA-INIS
PubMed Central
NASA Technical Reports
Agriculture and Applied Economics

Mechanical Engineering
Mechanical Engineer's Handbook 
Materials Handbook 

Civil Engineering
Ministry of Construction and Housing (Israel)
Israel Building Standards - Hebrew (Guide) 
National Building Research Institute (The Technion) Research Reports - Hebrew
Dekel Construction Costs - Hebrew (Guide) 
Construction Spec. - Hebrew
Sweets Construction
Israel Ministry of Transport
National Transportaion Lib. US
ASHRAE Standards (Read-Only)
National Fire Protection Association, Codes and Standards.  Requires registration. Free. (Read only).

Chemical Engineering
Kirk-Othmer Encyclopedia of Chemical Technology 
Ullmann's Encyclopedia of Industrial Chemistry 
NIST Chemistry

Computer Science and Software Engineering
ACM Digital Library.
O'Reilly Catalog.
IEEE Database.
MathSciNet.

Electrical and Electronics Engineering
IEEE Database 
Wiley Encyclopedia of Electrical and Electronics Engineering 
Israel Electricity Law and Standards (in Hebrew)

Art and Architecture
Art and Architecture Source
Frieze - Guide
Artstor Image Search
designboom
Google images
Pinterest (Requires free registration)
World International Design Database

General
Student Projects on Moodle
MIT OpenCourseWare
DSpace@MIT, MIT publications
Open Access Theses and Dissertations
Scientific American (latest years)
Oxford University Press Journals (archival pre-1995)
Old Library Book Catalog