A site designed for engineering professionals. The main feature of GloalSpec is a searchable database of suppliers, products, patents, standards, and material properties.
A project of the National Science Digital Library, This site allows the user to browse through carefully selected web sites of use to engineering students and professors. The site may also be searched using keywords.
Here is a list of blogs focused on Engineering and related topics. It isn't a complete list but a very good start for gathering information about the people, science and industry of engineering.
Many organizations and individuals involved in engineering have twitter feeds that provide updates and insights. This isn't complete, but provides links to that field.
A natural language computational engine that can provide results from identified reference sources on a variety of questions. The engine excels in complex computations.