THE INTERNET GUIDE TO ENGINEERING, MATHEMATICS, AND COMPUTING

This seems to be a great resource for engineering, mathematics and computing:
http://www.eevl.ac.uk/index.htm

Note for example its engineering Internet tutorials
http://www.eevl.ac.uk/vts/index.htm

and its online books of Internet Resources for these fields:
http://www.eevl.ac.uk/publications/