AVR

http://bray.velenje.cx/avr/

Connectors

http://samtec.com/germany/

Electronic Basics

http://www.elektronik-kompendium.de/

http://www.epanorama.net/links/basics.html 

Stuff

Bicycle wheel LED Display
LED blinker with thyristor

http://bwir.de/

LEDs

http://www.stockeryale.com/i/leds/lit/app001.htm

Assembler

http://webster.cs.ucr.edu/AoA/DOS/pdf/0_AoAPDF.html

http://www.acm.uiuc.edu/sigmil/RevEng/ch06.html

http://www.eventhelix.com/RealtimeMantra/Basics/CToAssemblyTranslation3.htm

Embedded Applications

http://ganssle.com/articles.htm

Transistor Comparison Table

http://xedox.de/transistor.html