...
- Sparkfun Electricity Basics - Great video series on the basics of electricity.
- Elektronik Compendium – Excellent explanations of electronics (Deutsch)
- All about circuits - In-depth explanations of electricity, from basic to advanced topics
- Tom Igoe – Many good explanations of basics
- Find Chips – The place to find datasheets for components
...
- hackaday - A news site for interesting "hacking" projects. Great A source of inspiration and new developments
- ITP – Very The very good documentation from the Interactive Telecommunications Program (ITP) at NYU
- makezine.com – A magazine for hobbyist, with many Arduino projects
- JeeLabs – Several interesting projects from Jean-Claude Wippler.
...