Education and tutorials

Electrician Toolbox - Basic electrical theory explained.
DC Circuits - Explained by the © Department of Physics, University of Guelph
Basic Electronics Tutorials - Free basic electronic tutorials but with lots of banner ads to scroll through.
Seminars from Hans Gall - Held seminars (in German) for various filter design software including QuickFil and S/FILSYN
Lectures and seminars by Munich Technical University - Various lectures and seminars (in German) by the Institute for circuit theory and signal processing in Munich.